Heavy-duty degreaser for grease that has gone hard

What makes a degreaser heavy duty

Household sprays are built for fresh, liquid grease: the film on a worktop an hour after cooking. A heavy-duty degreaser is built for grease that has been heated repeatedly until it polymerised into a hard carbon layer bonded to metal.

That requires three things working together — surfactants to break surface tension, solvents to soften the polymer, and enough alkalinity to saponify what's left. A spray with only the first of those will disappoint you on a grill grate every time.

Where heavy-duty degreaser earns its place

• BBQ grates, flame tamers and drip pans at end of season.
• Oven floors, doors and racks with layered spill carbon.
• Extractor hood filters clogged solid with airborne fat.
• Deep fryers and air fryer baskets with a varnished interior.
• Commercial kitchen line equipment cleaned on a nightly schedule.
• Engine bays, workshop benches and tools with oily film.

Heavy duty without the caustic downside

Industrial degreasers traditionally get their power from high-concentration lye. It works, and it comes with fumes, gloves, long dwell times and a real risk to aluminium and coatings.

GreaseKiller™ takes the solvent-and-surfactant route instead: strong enough for carbonised grease at two minutes, mild enough to use indoors with a window open. On truly catastrophic build-up a caustic product may still win on one pass — for everything most people meet, this is the better trade.

Getting maximum strength out of it

1. 1

   Let the surface cool completely

   Never spray a hot surface. Wait until the surface is cool to the touch, then brush or wipe away loose crumbs, ash and food debris so the foam reaches the grease itself.

2. 2

   Spray an even coat of foam

   Hold the bottle 4–6 inches away and lay down a thin, even layer. The foam is designed to cling to vertical surfaces, so you don't need to soak anything.

3. 3

   Wait about two minutes

   This is where the work happens. The formula penetrates the carbonised layer and breaks its bond with the metal. Very heavy build-up may want 4–5 minutes or a second coat.

4. 4

   Wipe, rinse and dry

   Wipe in one direction with a damp microfibre cloth. Use a soft brush on textured cast iron. Rinse any surface that will touch food, then dry to prevent water spots.