TL;DR
Soak a cooling rack in hot soapy water for thirty minutes to an hour before touching it with a brush -- baked on drips soften and release far more easily than they scrub off. On chrome plated racks the soak matters twice over, because the abrasive scrubbing people resort to instead is what strips the plating and starts the rust.
Why racks are harder than pans
A sheet pan is a flat surface you can reach with one motion. A cooling rack is dozens of thin round wires with crossing points and no flat area at all.
Residue lands on every side of every wire. A sponge only ever touches the top, so the underside of each wire stays coated no matter how long you scrub.
Racks used inside the oven are worse still. Roasted drippings and glazes go through a real baking process on the wire, polymerizing into a hard varnish rather than staying as soft grease.
This is why soaking is not laziness here -- it is the only method that reaches all sides at once. Soak first, agitate second is the general rule for baked residue, and it runs through the guide to cleaning kitchen tools without damaging them.
How do you clean a wire cooling rack?
Soak it in hot water with a generous amount of degreasing dish soap for thirty minutes to an hour, then scrub along the wires with a soft nylon brush that reaches both sides. Rinse with hot water and dry the rack completely, immediately, since trapped water at the wire joints is what causes rust.
The routine that works
1. Soak in hot soapy water. Use the sink, a roasting pan, or a large plastic tub if the rack does not fit. Water as hot as the tap runs, a generous squirt of degreasing dish soap, thirty to sixty minutes.
2. Add baking soda for heavy buildup. A few tablespoons in the soak water helps with polymerized fat. This is not a chemical trick so much as extra alkalinity.
3. Brush along the wires, not across. A long handled nylon dish brush or a bottle brush follows a wire and reaches its underside. Working across the grid just skims the tops.
4. Do the crossing points. Where two wires meet there is a tight junction that traps residue. A small toothbrush handles these.
5. Re soak rather than escalate. If residue remains, another thirty minutes in fresh hot soapy water beats reaching for steel wool.
6. Rinse with hot water. Hot rinse water carries dissolved fat away instead of redepositing it.
7. Dry completely and immediately. Towel dry, then air dry somewhere warm. This is the step that decides whether the rack rusts.
Chrome, stainless, and nonstick racks
Chrome plated racks are the most common and the most fragile. The plating is thin, and steel wool, scouring powders, and harsh pads wear through it. Once bare steel is exposed, rust follows and cannot be reversed. Chrome racks should also stay out of the dishwasher, where detergent dulls and eventually strips the plating.
Stainless steel racks are the durable option. They tolerate a dishwasher, resist rust well, and take firmer scrubbing with a nylon brush. Avoid chlorine bleach even on stainless, since chloride bleach pits it.
Nonstick coated racks need soft tools only. No abrasives at all, and no metal utensils. Once a coating is scratched, food sticks in the scratch permanently.
Knowing which you own is the first decision, exactly as it is with how to clean cookie cutters.
Can cooling racks go in the dishwasher?
Stainless racks generally can, if they fit without blocking the spray arms. Lay them flat on the lower rack or diagonally, and do not overload the machine around them.
Chrome plated racks should not. Dishwasher detergent is hard on chrome, and the heated dry cycle rarely reaches the wire junctions, so water sits there and starts rust.
Nonstick racks vary. Follow the manufacturer marking, and hand wash if it is not marked.
Removing rust from a rack
Light surface rust on a chrome rack can sometimes be reduced. Scrub gently with a baking soda paste on a soft cloth, or with a nylon pad, then rinse, dry immediately, and dry it fully in a warm switched off oven for ten minutes.
Do not use steel wool. It removes more plating and guarantees the rust returns, worse and faster.
Once rust is flaking, pitting the wire, or spread across a large area, replace the rack. Racks are inexpensive and a heavily corroded one is not worth restoring.
Storage matters too. Racks stacked while damp, or kept in a garage or unheated space where humidity swings, corrode much faster than racks kept dry indoors -- which in a wet Oregon winter is a meaningful difference.
Preventing baked on drips in the first place
Put a lined sheet pan underneath. A rack set over a foil or parchment lined pan catches everything and turns cleanup into throwing the liner away.
Soak immediately after use. A rack put straight into hot soapy water while still warm often needs no scrubbing at all.
Do not let a glazed rack cool dry. Sugar glazes set like cement. Get the rack wet before it cools completely.
Keep roasting racks and cooling racks separate if you can. A rack used only for cooling baked goods stays far cleaner than one that catches meat drippings.
The pans underneath have their own routine, covered in how to remove carbon buildup from baking sheets and how to clean a muffin tin.
Cleaning bakeware reduces residue and rancid flavor carryover. It is not a food safety program on its own.
Source: USDA Food Safety and Inspection Service guidance on cleaning food contact surfaces
FAQ
How do you get baked on grease off a cooling rack?
Soak it in hot water with a generous amount of degreasing dish soap for thirty minutes to an hour, adding a few tablespoons of baking soda for heavy buildup. Then brush along each wire with a soft nylon brush so both sides are reached. Re soak rather than switching to abrasives.
Can cooling racks go in the dishwasher?
Stainless steel racks generally can, laid flat or diagonally so they do not block the spray arms. Chrome plated racks should not, because dishwasher detergent dulls and strips the plating and the dry cycle leaves water at the wire junctions, which starts rust.
Why did my cooling rack rust?
Either the chrome plating was worn through by abrasive scrubbing or a dishwasher, or the rack was stored while still damp. Water sits at the crossing points where two wires meet, and it does not evaporate quickly there. Dry racks completely and immediately after every wash.
What is the best brush for cleaning a wire rack?
A long handled nylon dish brush or a bottle brush, both of which follow the length of a wire and reach its underside. Add a small toothbrush for the crossing points. Avoid steel wool and scouring powders, which strip chrome plating and scratch nonstick coatings.
How do you clean a cooling rack without scrubbing?
Soak it. Hot water plus degreasing dish soap for an hour softens most baked on drips enough that they wipe away. A second fresh soak handles what remains. Time in hot water does the work that scrubbing does, without any risk to the finish.
How do you stop drips baking onto a rack?
Set the rack over a sheet pan lined with foil or parchment, so the liner catches everything and gets thrown away. Then put the rack into hot soapy water while it is still warm, before any glaze or fat has a chance to cool and set on the wires.
Racks and pans are a soak and a brush. The oven and the kitchen around them take real time. If you would rather hand that off, get a quote or read more about house cleaning services.