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How to clean fiberglass grating?

by rose•

Hey there, thanks for swinging by my little corner of the web! If you’re here, chances are you’ve got fiberglass grating around your facility, on your deck, or maybe even on a project you’re wrapping up, and you’re staring at it like, “Wait, how do I actually clean this stuff without messing it up?” Full transparency – I’ve been selling fiberglass grating for 12 years now, and even I’ll admit, early on I saw customers overcomplicating this all the time. Some were using harsh chemicals that dulled the surface, others were scrubbing so hard they scratched the non-slip tops, and a few even tried power washing at full blast (spoiler: that’s a no-go). Today, I’m breaking down exactly how to clean fiberglass grating the right way – no fancy tools, no weird hacks, just solid, proven tips from someone who’s seen it all. Fiberglass Grating

First off, let’s get one thing straight: fiberglass grating is tough. It’s built to hold up to way more abuse than regular steel or wood – stands up to chemicals, doesn’t rust, resists rot, that’s why we sell so much of it for chemical plants, food processing facilities, and even marine docks. But “tough” doesn’t mean “indestructible.” If you clean it wrong, you can damage the surface, cut down its lifespan, and even make it less safe (especially if it’s non-slip grating, which is super common for walkways). So let’s start with pre-cleaning prep, because skipping this step is where most people go wrong.

Before you even grab a bucket, figure out what type of gunk you’re dealing with. That makes such a difference – cleaning oil off a food processing grating is way different than cleaning dirt and mildew off a backyard patio grating, or degreasing heavy industrial grime from a factory floor. Let’s categorize this real quick:

  1. Light everyday mess: dirt, dust, leaf litter, minor grime from foot traffic. This is the most common, especially for guys who have grating on their loading docks, storage yards, or even residential porch extensions.
  2. Medium mess: mildew, light oil spills (like from a lawnmower or small equipment), mild chemical residue (think from cleaning supplies or common workshop chemicals).
  3. Heavy industrial mess: heavy machine oil, grease, chemical spills (acids, alkalis, solvents – the kind you get at a refinery, manufacturing plant, or wastewater treatment facility).

Once you know what you’re up against, you don’t need to run out and buy a bunch of expensive stuff. In fact, most of what you need is probably already in your garage or supply closet. Let’s start with the easiest scenario first: light everyday dirt. This is the kind that builds up over a month or two, no spills, just regular use.

For light dirt: All you need is a stiff nylon brush (don’t use steel wool or a metal brush – that will scratch the fiberglass surface and leave tiny metal particles that can rust over time, weirdly enough), warm water, and a squirt of mild dish soap. That’s it. No pressure washer, no harsh chemicals. Just mix the soap and water in a bucket, dip your brush in, and scrub in the direction of the grating’s bars – don’t scrub back and forth across the grooves too hard, that’s how you get debris stuck and scratch the non-slip texture (if yours has it). For bigger areas, you can even use a garden hose to pre-rinse first, just keep the pressure low – like, the setting that’s just a steady stream, not the jet setting. High pressure here can push water up under the grating if it’s installed over a hollow frame, or even etch the surface if you hold it too close. I had a customer last year who tried power washing his patio grating at max pressure to get leaves off, and it left those little indentations that make it collect dirt way faster. Oops.

Next up, medium mess: mildew and light oil. This is where you might need a little extra oomph, but still nothing crazy. For mildew, a lot of people reach for bleach, but wait – bleach can discolor fiberglass over time, especially if it’s colored. I always recommend a mild mildew cleaner that’s made for outdoor surfaces, or even a mix of 1 cup of white vinegar to 1 gallon of warm water. Vinegar is great because it’s non-toxic, doesn’t harm the fiberglass, and kills mildew without the fumes. For light oil spills, dish soap works, but you might need to let it sit for 5-10 minutes before scrubbing to let it break down the oil. If dish soap isn’t cutting it, a simple phosphate-free laundry detergent mixed with warm water works too – just avoid anything with harsh fragrances or bleaches, like the ones for tough stains. Also, if you’re cleaning a vertical surface (like grating on a building’s catwalk), start from the top and work your way down, so you don’t get dirty suds dripping onto already clean areas. That’s a little trick I learned after watching a new hire on a refinery project make that exact mistake.

Now, the big one: heavy industrial mess. This is for when you’ve got grease that’s been caked on for weeks, or chemical spills that left a residue. First, and this is super important – check the compatibility of any chemical cleaner with your fiberglass grating. Most standard fiberglass is resistant to a wide range of chemicals, but not all. For example, strong solvents like acetone can damage some lower-grade fiberglass, so always test a small, inconspicuous spot first before going all in. That test spot doesn’t have to be anything big – like a corner under a piece of equipment or a spot between two bars that no one will see. Wait 15 minutes, wipe it off, and check if the surface is dulled or discolored before using the cleaner on the whole area.

For heavy grease and industrial grime, a heavy-duty degreaser made for composite surfaces is your best bet. Look for something that’s labeled safe for fiberglass and non-slip surfaces – avoid citrus-based degreasers if you have colored fiberglass, because citrus can fade it over time. Spray the degreaser on, let it sit for 10-15 minutes (don’t let it dry, though – if it starts to dry, spritz a little more water to keep it wet), then scrub with that same stiff nylon brush. If you’re dealing with really thick, caked-on gunk, you might need to do two passes: first to break up the top layer, then a second scrub to get the rest. And definitely don’t use a metal scraper here – you’ll scratch the surface so bad, you might as well replace the grating. For large industrial floors, a floor scrubber with a soft-bristle brush attachment works great, way faster than doing it by hand, just keep the pressure low.

Now, what about the big no-no’s? I see these all the time, so let’s get them out of the way. First, never use steel wool or metal brushes. Like I said earlier, those leave tiny metal shavings that can corrode over time, and they scratch the fiberglass surface, which makes it way more likely to collect dirt and degrade. Second, never use a high-pressure washer (above 1500 PSI) within 12 inches of the grating. Even if you get it right, the force can lift the surface of the fiberglass or push water into the underlying structure, which can cause mold or mildew under the grating. Third, never use undiluted bleach or harsh acids/alkalis unless you’ve checked compatibility and tested the spot. Even if your grating says it’s chemical-resistant, undiluted cleaners can cause discoloration or weakening over repeated use. And fourth, don’t skip rinsing! No matter what cleaner you use, you have to rinse it off completely. Residual cleaner can leave a sticky film that attracts more dirt, or even damage the grating over time. A gentle garden hose rinse is all you need – make sure to get all the crevices and grooves, too, where dirt and cleaner can get stuck.

Wait, what about regular maintenance? Cleaning isn’t just a one-time job, right? The best way to keep your fiberglass grating looking good and working well is to do small, regular cleans instead of waiting for it to get nasty. For light foot traffic or general use, a monthly quick scrub with mild soap and warm water is enough. For industrial areas or high-traffic docks, every two weeks is a good rule of thumb. If you have areas that get regular spills (like a loading dock where oil drips from trucks), spot-clean those as soon as you see the mess – don’t let it set for days, that makes it way harder to clean and can actually etch the surface over time. I always tell my customers: a 5-minute spot clean is way better than a 2-hour deep scrub later.

Also, what about specific situations? Let’s cover a couple common ones that I get asked about all the time. First, marine grating, which is super popular for docks and boat slips. That gets exposed to saltwater, which can leave a crusty residue. For that, a mix of warm water, mild soap, and a little bit of baking soda works great to cut through salt. Just scrub it down, rinse thoroughly, and that’s it. Salt doesn’t damage fiberglass, but the residue can make it slippery, so cleaning that off is important for safety. Second, food processing grating, which has to be safe for contact with food. For that, all-purpose, food-safe cleaners work perfectly – no need for anything fancy. Just make sure to rinse extra well, and avoid any cleaners with harsh chemicals that could transfer to food. Third, grating with a non-slip surface – a lot of people worry about scrubbing that off, but as long as you use a soft nylon brush and scrub in the direction of the bars, you won’t damage the non-slip texture. Avoid rough scrub pads, those can wear down the non-slip over time.

If you’ve made it this far, chances are you’re either working on a project with fiberglass grating, or you’re in charge of maintaining it at a facility. Here’s the thing: we’ve been selling fiberglass grating for years, not just as a product, but we’ve got a whole team that helps customers with installation, maintenance, and all the little stuff that comes with it. If you’re not sure what kind of cleaner is safe for your specific grating, if you have a big cleaning job you need help planning, or even if you’re looking to replace old, worn-out grating that’s been hard to maintain, we’re here to help. Our team can walk you through exactly what works for your situation, no pushy sales stuff, just straight answers. Whether you need a small batch of grating for a backyard project or bulk orders for a commercial facility, we’ve got you covered.

Now, before you go, let’s recap the quick cheat sheet so you don’t have to re-read this whole thing:

  1. Know your mess: light, medium, heavy – match your cleaner to the gunk.
  2. Skip the harsh stuff: no metal brushes, no max pressure power washers, no undiluted cleaners unless tested.
  3. Test first: always check a small spot before using a new cleaner.
  4. Rinse thoroughly: don’t leave soap or cleaner residue behind.
  5. Do regular small cleans: way easier than deep cleaning later.

If you have any other questions about cleaning fiberglass grating, or if you’re ready to chat about getting new grating for your project, feel free to reach out. We’re always happy to help with whatever you need, no matter how big or small the job is.

Fiberglass Grating References:

  1. Fiberglass Grating Manufacturers Association. (2021). Maintenance and Cleaning Guidelines for Standard and Non-Slip Fiberglass Grating.
  2. American National Standards Institute. (2019). ANSI/ICSA-119: Practice for Cleaning and Maintaining Fiber Reinforced Polymer (FRP) Composite Grating.
  3. Composite Fabricators Association. (2020). Care and Maintenance Guide for FRP Grating in Industrial and Commercial Applications.

Hebei Shunbo Metal Wire Mesh Manufacturing Co., Ltd.
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