How to Clean and Season a Commercial LPG Griddle (Steel Plate Guide)

Last updated: July 2026

A commercial LPG griddle earns its keep every single service. Ten minutes of cleaning at the end of the day keeps the plate cooking evenly and stops rust before it starts.

Scrape, wash, dry, then oil is the accepted routine for cleaning and seasoning a steel griddle plate. It’s the method Lincat sets out in its own GS-series manual, and it works on any machined-steel LPG griddle in a food van.

In 30 seconds:

• Scrape the plate down after every service. Do a full wash and re-oil at the end of the day.
• Seasoning is simply a thin coat of cooking oil on a clean, dry plate. It stops rust and builds a natural non-stick surface.
• Never water-jet or pressure-wash a commercial griddle. Warm water and mild detergent only.
• Heavy carbon comes off with a proper degreaser — Lincat recommends Carbon-Off — not brute force.
• Cleaning is your job. A Gas Safe registered engineer should still service the griddle every 6 months.

Why trust this routine? It comes straight from the Lincat installation and servicing manual (IS212) for the GS4/P and GS7/P — the two propane griddles we recommend most for food vans. If you haven’t installed yours yet, start with our guide to setting up an LPG griddle in a food van.

The honest bit: the biggest mistake caterers make is washing the plate and walking away. A clean, wet, unoiled steel plate starts rusting overnight. The oil coat is the step that matters most.

Your griddle cleaning schedule at a glance

What you’ll need

• Griddle scraper — stainless steel, flat blade. Your main tool.
• Mild detergent — ordinary washing-up liquid is fine. Nothing caustic.
• Warm water and cloths — one for washing, one for drying.
• Cooking oil — any high smoke-point oil (rapeseed or vegetable oil works well).
• Wire brush — for stubborn carbon on steel plates only. Wear eye protection.
• Food-safe degreaser — such as Carbon-Off, for heavy build-up a scraper won’t shift.

That’s it. No steam cleaner, no pressure washer, no oven cleaner. The Lincat manual is blunt about this: these units must not be cleaned using a water jet, and abrasives will scratch the stainless outer panels.

How to clean and season a steel LPG griddle plate

This is the end-of-day routine for a machined-steel plate like the Lincat GS4/P or GS7/P. Steel plates hold heat brilliantly — the GS7/P’s plate is 12mm thick — but bare steel rusts, so the routine always ends with oil.

1. Turn off and let the plate cool to warm. Shut the burner control to OFF. A warm plate cleans far more easily than a cold one — residue lifts instead of setting.
2. Scrape everything into the fat drawer. Work the scraper front to back. Get the grease channels too.
3. Wash with warm water and mild detergent. Use a cloth or non-abrasive pad. Work in sections on a big plate.
4. Rinse off every trace of detergent. Wipe with clean water. Leftover detergent taints the plate and breaks down your seasoning.
5. Dry the plate thoroughly. Water left sitting on bare steel is what causes overnight rust.
6. Apply a thin coat of cooking oil. Wipe a little oil across the whole plate with kitchen paper. You want a sheen, not a puddle. This is the seasoning step.
7. Empty and wash the fat drawer. Refit it properly — the griddle shouldn’t be used without it in place.

What seasoning actually does

Seasoning sounds like chef mystique. It isn’t. On a griddle it does two simple jobs.

It stops rust. A machined-steel plate is bare metal. The thin oil film seals it from moisture between services.

It builds a non-stick surface. Each time the oiled plate heats up, a little of the oil bonds to the steel. Over weeks this builds a dark, slick patina. A well-seasoned plate releases burgers and onions with far less sticking — and a dark plate is a sign of a well-run griddle, not a dirty one.

Seasoning a new plate: before first use, wash the plate with hot soapy water to remove the factory protective coating, dry it, and wipe on a light coat of oil. Then heat the griddle for around 20 minutes and let it cool. Repeat the oil-and-heat cycle two or three times and you’ve got a working base layer.

Shifting heavy carbon build-up

Miss a few end-of-day cleans and you’ll get black, baked-on carbon that a scraper skates over. Don’t attack it harder — work smarter.

• Use a wire brush on steel plates. Lincat approves this — but wear eye protection. Carbon flakes fly.
• Use a proper degreaser for the worst of it. Lincat recommends Carbon-Off for heavy, stubborn deposits. Apply to a warm (not hot) plate, let it work, then scrape and wash as normal.
• Re-season afterwards. A deep clean strips the plate back to bare steel. Always finish with the oil coat, or it will rust.

Chromed plates are different

Some griddles have a mirror-chrome plate instead of machined steel. The rules change: no wire brush, no scraper corners, no sharp tools — they’ll scratch the chrome permanently.

Instead: turn the griddle off and let it cool for 15 minutes. Flush the plate with a small amount of water to soften residue. Loosen debris with a stiff bristle brush, sweep it into the fat drawer, then repeat the flush with a drop of mild detergent. Finish by wiping with a soft cloth. Chromed plates don’t need seasoning — the chrome itself is the protective layer.

What never to do

• Never pressure-wash or water-jet the griddle. Water gets into the burner assembly, controls and pilot — and it’s an outright ban in the manufacturer’s manual.
• Never use abrasives on the outer panels. Scourers scratch stainless steel. Warm soapy water and a cloth is all the bodywork needs.
• Never use caustic oven cleaner on a seasoned steel plate. It strips the seasoning you’ve spent weeks building and can taint food.
• Never leave the plate wet. Dry it, oil it, every time.
• Never soak the burner-side parts. The fat drawer itself washes like any tray — everything on the propane side stays dry and is the engineer’s territory.

Cleaning is yours — servicing is the engineer’s

Daily cleaning keeps the plate right, but it doesn’t touch the LPG side of the appliance. Lincat recommends a competent engineer services these griddles every 6 months — in the UK that means Gas Safe registered for commercial catering LPG.

The service covers burner condition, thermocouple cleaning and position, burner pressure at the test nipple, and a soundness check. Budget £120–£180 for a typical visit. It also keeps your warranty intact — the GS7/P carries 2-year parts and labour cover, and unauthorised work can void it.

While you’re in a weekly cleaning rhythm, give the hose and regulator a visual once-over too. Our LPG hose and regulator guide covers exactly what to look for and when parts need replacing.

What the kit costs

Compare that with the cost of neglect: a pitted, rusted plate cooks unevenly, sticks constantly and eventually needs professional re-machining or replacement. On a griddle like the Lincat GS7/P (from £1,499), ten minutes a day protects a four-figure investment.

Looking at your options? Browse our full LPG griddle range — every unit runs on propane at 37 mbar, sized for food-van and trailer work.

FAQs: cleaning and seasoning an LPG griddle

How often should I clean a commercial LPG griddle?

Scrape the plate after every service and do a full 10-minute clean at the end of each trading day. The full routine is scrape, wash with mild detergent, rinse, dry, then wipe on a thin oil coat. Weekly, add the outer panels and a deep fat-drawer clean.

How do you season a steel griddle plate?

Wipe a thin coat of high smoke-point cooking oil over the clean, dry plate, then heat the griddle for around 20 minutes and let it cool. Repeat two or three times on a new plate. After that, the light oil wipe at the end of each day’s clean maintains the seasoning.

What oil is best for seasoning a griddle?

Any high smoke-point oil works: rapeseed and standard vegetable oil are the practical choices for caterers, and you’ll already have them on the van. Avoid butter and olive oil — they burn at griddle temperatures and go sticky rather than forming a hard seasoning layer.

Can I use a wire brush on my griddle plate?

Yes — on a machined-steel plate. Lincat approves wire-brushing carbon deposits off steel plates, but says eye protection must be worn. Never use a wire brush, scraper corner or any sharp tool on a chromed plate: it will scratch the chrome permanently and there’s no repairing it.

How do I remove heavy carbon build-up from a griddle?

Warm the plate slightly, apply a food-safe degreaser such as Carbon-Off, give it time to work, then scrape and wash as normal. Finish with a rinse, a thorough dry and a fresh oil coat, because a deep clean strips the plate back to bare steel and it will rust unprotected.

Why is my griddle plate rusting?

It was left wet or unoiled — bare machined steel rusts overnight in a damp van. Light surface rust isn’t fatal: wire-brush it off, wash, dry and re-season with two or three oil-and-heat cycles. Prevent it by finishing every clean with a thin oil wipe over a completely dry plate.

Can I pressure-wash a commercial griddle?

No — never. Lincat’s manual states these units must not be cleaned with a water jet. Pressurised water forces its way into the burner assembly, pilot and controls, causing misfires and corrosion. Warm water, mild detergent and a cloth handle everything the plate and panels need. If you also run a fryer, the same rule applies — see our LPG fryer cleaning guide.

Does cleaning replace servicing?

No. Cleaning keeps the cooking surface right, but the propane side — burners, thermocouple, pressure, soundness — needs a Gas Safe registered engineer every 6 months, per Lincat’s recommendation. Budget £120–£180 per visit. Skipping service risks your warranty and, more importantly, your safety at the hatch.