TL;DR
Rinse a potato ricer within a few minutes of use, pushing water backward through the perforated plate so the plugs come out the way they went in. Dried starch inside a ricer hole is the single hardest kitchen residue to remove, and a fifteen to twenty minute hot soak plus a toothpick is the only reliable fix once it sets.
Why a ricer clogs so badly
A ricer works by forcing cooked potato through dozens of small holes in a metal plate. Every one of those holes ends up packed with a plug of starch under pressure.
Wet, that plug rinses out. Dry, it becomes a hard cylinder wedged in a hole barely wider than it is, with no easy way to reach it from either side.
The pressure is what makes this worse than a masher. Potato that was pushed into a hole by a lever is much more tightly packed than potato that simply fell into a grid. Tools that force food through small openings all share this problem, which is why a garlic press fails in exactly the same way.
How do you clean a potato ricer?
Empty it, then run warm water backward through the plate -- from the outside face toward the hopper -- so the plugs push out the direction they entered. Wash with dish soap and a nylon brush, clear any remaining holes with a toothpick, rinse, and dry fully. Soak in hot soapy water first if the starch has already dried.
The order that actually works
1. Scrape the hopper. Get the loose potato out with a spatula before any water touches it. Less material means fewer plugs.
2. Rinse backward through the plate. This is the step people skip. Hold the ricer so the tap runs against the outside face of the perforated plate. The plugs travel back into the hopper instead of jamming deeper.
3. Wash with warm soapy water. Dish soap cuts the butter and cream that make starch cling. Use a nylon brush on both faces of the plate.
4. Clear the survivors individually. A wooden toothpick, a bamboo skewer, or a straightened paperclip pushes a stubborn plug through. Work from the outside face inward, matching the direction of the rinse.
5. Do the hinge and lever. Food collects at the pivot and along the inside of the hopper rim. Open the tool fully and brush both.
6. Dry completely, in the open position. A closed ricer traps water against the plate, and on plated or carbon steel tools that means rust.
Rescuing a ricer that already dried
Do not force it. Bending a perforated plate is permanent, and prying with a knife tip both damages the plate and risks your hand.
Submerge the head in water as hot as the tap runs with a good squirt of dish soap and leave it fifteen to twenty minutes. Hot water rehydrates starch, which is the only thing that reliably loosens it.
Rinse backward again after the soak. Most of the holes clear on their own. Repeat the soak once for whatever remains rather than escalating to a metal pick.
If the ricer has an interchangeable disc, take it out before soaking so both faces are exposed and water reaches the holes from both directions.
Cleaning a food mill
A food mill is the same problem with more parts. It has a perforated disc, a curved blade, a crank shaft, and a spring clip, and food packs into all of them.
Take it apart every time. A food mill left assembled after use is not cleanable, because the disc sits flush against the blade and traps a layer of pulp between them.
Wash each piece separately with a brush, paying attention to the underside of the blade and the slot the shaft passes through. Dry the parts separately as well, then reassemble only when everything is dry.
Fine perforated screens follow the same logic as a mesh sieve, where the trick is always to push soil back out the side it came in -- see how to clean a fine mesh sieve.
Is a potato ricer dishwasher safe?
Many all metal ricers are labeled dishwasher safe, but a dishwasher will not clear a packed hole because water never travels through the plate under pressure. Rinse and clear the holes by hand first, then use the dishwasher for washing rather than for unclogging.
Ricers with painted, coated, or wooden handles should be washed by hand. Detergent and sustained heat dull coatings and dry out wood.
Mistakes that ruin the plate
Metal picks and knife tips. They widen and deform holes, which makes the ricer produce uneven texture forever after.
Steel wool. It scratches the plate, and a scratched surface holds starch more tightly next time.
Chlorine bleach. Chloride bleach pits stainless steel and leaves permanent dark marks. Bleach should also never be combined with ammonia, with vinegar or any other acid, or with rubbing alcohol, because each of those mixtures releases a toxic gas.
Storing it damp and closed. This is how the pivot rusts and stiffens.
The general rule for any tool with small openings is that soaking and patience do the work, not force. That principle runs through the whole guide to cleaning kitchen tools without damaging them.
Keeping it easy next time
Rinse before you serve. The pot of potatoes will stay warm for the two minutes it takes to run the ricer under the tap, and that single habit removes the entire hard version of this job.
If a ricer sits between courses, park it in a bowl of warm water rather than on the counter. Starch that never dries never sets. A masher benefits from the same trick, as covered in how to clean a potato masher.
Cleaning a tool thoroughly reduces the residue carried into your next dish. It is not a food safety program on its own, and hot holding, cooling, and storage rules are a separate matter.
Source: USDA Food Safety and Inspection Service guidance on cleaning food contact utensils
FAQ
How do you unclog a potato ricer?
Run warm water backward through the perforated plate so the plugs exit the way they entered, then clear any remaining holes with a wooden toothpick or a bamboo skewer. If the starch has dried, soak the head in hot soapy water for fifteen to twenty minutes before trying again.
Can you put a potato ricer in the dishwasher?
Many all metal ricers are dishwasher safe, but a dishwasher will not clear packed holes, because the spray never pushes water through the plate. Rinse and clear the perforations by hand first. Wash ricers with wooden or coated handles by hand only.
Why does my ricer still have potato in the holes after washing?
Because water was run over the plate rather than through it. Direct the tap at the outside face so the flow pushes each plug back into the hopper. Anything left after that needs a hot soapy soak, not more scrubbing on the surface.
What can I use to clear the holes without damaging them?
A wooden toothpick, a bamboo skewer, or a straightened paperclip used gently. Avoid knife tips and metal picks, which widen and deform the holes and leave the ricer producing uneven texture from then on.
How do you clean a food mill?
Take it fully apart every time -- disc, blade, shaft, and clip. Left assembled, a layer of pulp stays trapped between the blade and the disc where nothing can reach it. Wash each part separately with a brush, dry them separately, and reassemble only once dry.
How do you stop a ricer from rusting?
Dry it completely and store it open rather than closed, so no water is trapped against the plate or in the pivot. Skip chlorine bleach entirely, since it pits stainless steel, and hand dry rather than leaving it to drip in a crowded rack.
Small tools are quick once you know the trick, but the kitchen around them -- the range, the counters, the floor under the stove -- takes real time. If you would rather hand that off, get a quote or read more about house cleaning services.