How to Clean Grill Grates: Cast Iron, Stainless & Porcelain

Which grates do you have?

Your grate material decides how hard you can scrub and what you can soak.

Gas grill grates and charcoal grates clean the same way; only the material changes the method. Find yours, then follow the matching deep clean in Step 4.

Not sure? Your manual or our review of your grill will say. The Weber Spirit E-325 uses porcelain-enameled cast iron, the Broil King Regal S 420 Pro uses heavy 9mm stainless rods, and the Weber Original Kettle 22 uses a plated steel grate that our review found is the first part to wear out.

Thick stainless rods can take a stiff brush that would chip enamel.

What's the safest tool for cleaning grill grates?

A bristle-free brush or wooden scraper avoids the one real hazard: loose wire.

Wire brushes clean well, but loose bristles can end up in food. A study of U.S. emergency department data estimated 1,698 injuries from wire grill brush bristles between 2002 and 2014, mostly in the mouth and throat.

In a pinch, a ball of crumpled foil held in tongs scrapes a hot grate. Skip it on porcelain, where it can scratch.

What do you need to clean grill grates?

Most of it is already in your kitchen.

• A grill brush, bristle-free coil brush or wooden scraper
• A tub or bucket big enough for the grates, or an old towel to work on
• Dish soap and a non-scratch scrub pad
• White vinegar and a spray bottle
• Baking soda for stubborn spots
• Paper towels, tongs and a high smoke-point oil such as canola or avocado
• Rubber gloves

Step-by-Step: How to Clean Grill Grates

Steps 1 and 2 are the after-cook clean; Steps 3 to 7 are the deep clean.

How often should you clean grill grates?

Brush after every cook; deep clean about once a month in grilling season.

• Grill once a week or less: brush every cook and deep clean every 2–3 months.
• Grill several times a week: brush every cook and deep clean monthly.
• Use sugary sauces or marinades often: add a spot scrub whenever you see crusted sauce.
• Putting the grill away for winter: deep clean and oil before storage, then brush at the first spring cook. Our grill winterizing checklist covers the rest of the grill.

A little dark seasoning on cast iron is good. Thick, flaking carbon is not, because it falls onto food and makes the next cook stick.

How do you clean cast iron grill grates?

Hot water, a stiff brush, complete drying and a thin coat of oil, every time.

Bare cast iron relies on its baked-on oil layer for rust protection and easy release, so the goal is to clean the food off without stripping that layer. Treat porcelain-enameled cast iron like porcelain instead; the steps below are for matte, uncoated iron.

Cleaning bare cast iron

Brush hot after every cook (Steps 1–2). For a deep clean, scrub the cooled grates with hot water and a stiff brush, then dry them on a warm grill and wipe on a thin coat of oil.

Removing rust from cast iron

Re-seasoning cast iron grates

Rub a very thin coat of high smoke-point oil over every surface, wipe off the excess and run the grill on high until the oil stops smoking (Step 7). If the grates feel sticky or gummy afterward, the coat was too thick: burn it off on high and use much less oil next time.

What not to use on cast iron

• Long soaks in soapy water, which strip seasoning and start rust
• The dishwasher
• Air drying, since wet iron rusts within hours
• Oven cleaner, unless the grate maker says it's safe

How do you get rust off grill grates?

Light surface rust comes off stainless and porcelain; deep pitting means new grates.

Stainless steel

Let the vinegar mix sit before you scrub; it loosens rust stains so the paste does less work.

Porcelain-enameled

Why are your grates still dirty or sticky?

Most leftover problems come from heat, oil or the lid above the grates.

Food still sticks after cleaning

Black flakes on food

When should you replace grill grates?

Replace them when the metal fails, not when the grime wins.

Replace your grates when you see any of these:

• Porcelain chipped across large areas and rusting underneath
• Cast iron pitted, cracked or flaking
• Bars warped, sagging or burned thin
• A plated grate with the plating worn through to rusty steel

Order grates by your grill's model number from the maker, or measure the cookbox for a third-party set. If the burners and firebox are worn out too, a new grill may cost less than the parts; compare options in our best gas grills under $500.

Before you choose new grates or a new grill, use this quick routine for the ones you have:

• Short on time: burn off and brush hot after every cook; skip the deep clean until the bars look crusted.
• Bare cast iron: never soak it, and always finish with oil and heat.
• Porcelain: use a gentle brush and soapy soak; no metal scrapers.
• Worried about bristles: switch to a coil brush or wooden scraper.
• Whole grill looks rough: follow our grill cleaning and maintenance guide for burners, grease trays and the cookbox.

The Takeaway

A two-minute brush after every cook prevents most of the hard scrubbing. Know your grate material, treat it the way it likes, and replace grates when the metal, not the grime, is the problem.