How to Remove Pink Slime From an Ice Maker

The first time I lifted the lid on a test Frigidaire EFIC237 and saw a rosy pink smear ringing the water line, I assumed it was mineral staining from our hard tap water. It was not. A quick wipe with a paper towel confirmed it: the stuff was slick, faintly slimy, and it came off in a smudge rather than a crust.

That slick feel is the tell. Pink slime in ice maker reservoirs is almost always a bacterium called Serratia marcescens, and it thrives in exactly the warm, still, damp corners these machines love to create.

The good news is that removing it is straightforward with things you already have under the sink. The catch is that scrubbing alone will not keep it gone. Let me walk you through both halves.

Why it is pink slime and not scale

Scale is hard and chalky. It builds up as a white or grayish crust on the freeze plate, the evaporator fingers, and anywhere water sits and evaporates. You can feel it grind under your fingernail.

Pink slime behaves nothing like that. It smears, it wipes into a streak, and it shows up on plastic surfaces the water touches: the reservoir walls, the ice chute, the underside of the lid, the little float or fill line. Serratia marcescens is airborne and common in bathrooms and kitchens, which is why you also see that pink ring in toilet bowls and shower grout.

If your buildup is white and crusty instead, you are dealing with minerals, and the fix is different. That is a job for a mild acid soak, which I cover in the guide on how to descale an ice maker with vinegar. Pink slime laughs at vinegar because acid is not what kills it.

What you will need

Nothing exotic. Here is the short kit I keep on the counter before I start:

• Unscented liquid bleach, or 3 percent hydrogen peroxide from the drugstore
• A soft bottle brush or an old toothbrush for tight corners
• A clean microfiber cloth and a few paper towels
• A measuring spoon and a cup of clean water
• Dish soap for the first pass

Skip the abrasive scrub pads. They scratch the plastic, and those micro-scratches give the next batch of bacteria a rougher surface to grip. A soft brush does more good and less harm.

Step by step: removing the pink slime

1. Power down and empty the tank. Unplug the machine. Drain every drop of standing water. On most countertop units there is a plug or a tip-and-pour drain on the underside. If yours hides it, the walkthrough on how to drain an ice maker completely shows where each brand tucks it.
2. Do a soap pass first. Wipe the reservoir, lid, and chute with warm water and a drop of dish soap. This lifts the loose slime so your sanitizer can actually reach the surface instead of sitting on top of gunk.
3. Mix your sanitizer. For bleach, use roughly 1 tablespoon per gallon of water, or about 1 teaspoon per quart if you are mixing a small batch. For hydrogen peroxide, use it straight from the bottle at 3 percent. Do not combine the two.
4. Scrub the surfaces. Dip your brush in the solution and work every spot the water touches. Get the reservoir walls, the float, the fill line, the seam where the lid meets the base, and the ice chute. Pink slime loves seams and corners, so spend your time there.
5. Let it dwell. Leave the solution on the surfaces for 5 to 10 minutes. Contact time is what kills the bacteria, not the scrubbing itself.
6. Run a sanitizing fill if the machine allows it. Pour the diluted solution into the reservoir and run one short cycle so it circulates through the pump and internal lines. Toss any ice or slush it makes.
7. Rinse like you mean it. Fill with clean water, run a full cycle, drain, and repeat two or three times. Discard all of that ice. I run at least three fresh-water cycles on a bleach clean because I would rather over-rinse than taste chlorine in my drink.
8. Dry it open. Wipe everything down and leave the lid up so the interior can air out completely before the next use.

Reaching the corners you cannot see

Most people scrub what is easy to reach and call it done. The slime that survives is hiding in the spots the cloth skips: under the float, inside the fill spout, along the gasket, and up in the chute where ice drops into the basket.

On a GE Profile Opal, the reservoir sits under a removable cover and the pump area collects the worst of it. Pop out whatever the manual says is removable and clean those pieces in the sink. The Opal cleaning walkthrough covers which parts come out safely.

An old toothbrush is your best friend here. Bend the bristles into the seam and drag them along the joint. If you see the pink streak transfer to the brush, you found live slime that a wider tool was gliding right over.

The pink you can see is the easy part. The pink you cannot see is why it comes back.

Why it keeps coming back

Here is the frustrating truth I learned the hard way. You can sanitize a tank spotless and find a faint pink haze again in two weeks if the reservoir stays wet between uses.

Serratia needs three things: moisture, a little warmth, and something to feed on. A countertop ice maker that sits with a half inch of standing water in a 72 degree kitchen hands it all three on a plate. The bacteria is essentially always present in the air, so a damp tank is an open invitation.

That is why the real fix is a dry tank, not a stronger chemical. When I stopped leaving water in my test units overnight, the pink stopped returning. Draining and drying is the single habit that matters most.

A prevention routine that actually sticks

You do not need to deep clean weekly. You need a light rhythm that keeps the tank hostile to bacteria.

If you want a full calendar you can actually follow, I mapped one out in the ice maker cleaning schedule, and it dovetails with the broader routine in my guide on how to clean an ice maker. Both lean on the same idea: small and regular beats heroic and rare.

Your incoming water quality plays a role too. If your tap runs hard or heavy with sediment, a filter cuts down on the nutrients bacteria feed on. The CDC has a plain-language overview of healthy water practices at home if you want to understand what is coming out of your line before it ever reaches the tank.

A common mistake to avoid

The mistake I see most often is treating pink slime like scale and reaching for a vinegar soak. Vinegar dissolves minerals beautifully, but it does not reliably kill Serratia, so the pink comes right back and people conclude the machine is defective.

The second mistake is the opposite: dumping in way too much bleach and then under-rinsing. You end up with ice that smells faintly of a swimming pool. Measure the dilution, respect the dwell time, and rinse three times. That combination does the job without leaving a chemical aftertaste.

Making the call

Pink slime looks alarming, but it is one of the more forgiving problems a countertop ice maker throws at you. Identify it by the slick, wipeable texture, scrub it out with a diluted bleach or peroxide solution, hit the hidden seams, and rinse thoroughly. That clears what is there.

Keeping it gone is the easier half once you accept the rule: a dry tank does not grow slime. Drain it, dry it, leave the lid up, and you will spend far more time enjoying ice than scrubbing the machine that makes it.