Warning: Disconnect power before servicing.
ErrBase

Best Washing Machine Cleaner for Top Loaders

Quick Answer

Affresh Washing Machine Cleaner is the best choice for top loaders because its slow-dissolve tablet formula survives the high-water volume of a deep-fill cycle. While liquid cleaners often wash away too quickly, these tablets stay active long enough to break down the biofilm hidden between the inner and outer tubs.

If you skip monthly cleaning, you're basically running your laundry through a biofilm farm. That hidden gunk between the inner and outer tubs doesn't just smell awful, it redeposits bacteria back onto every load you wash. And once mineral scale starts coating the pump and agitator, you're heading toward a repair bill that's a whole lot more than a six-dollar tablet once a month.

GenericWasherSeverity: low
Time to Fix
5–15 min
Difficulty
beginner
Parts Cost
$6 – $15
Tools Needed
Rubber gloves, Microfiber cloths (at least 2)

What Does the BEST-CLEANER Code Mean?

OK so here's the deal with top loaders specifically. They use way more water than front loaders, which sounds like it'd keep things clean but actually makes them way more prone to soap scum and biofilm buildup. I see this constantly. People call me about a smelly washer and nine times out of ten they've never run a cleaning cycle in three years. A single Affresh tablet once a month is basically cheap insurance for a machine that costs hundreds to replace.

Common Causes

  • Using too much detergent, especially in cold water cycles where it doesn't fully dissolve, leaves a sticky film on the drum, agitator, and outer tub that becomes a perfect breeding ground for mold and bacteria over time.
  • Hard water deposits calcium and magnesium scale onto the inner tub surfaces, and that mineral crust traps soap residue and locks in odors in a way that a regular wash cycle absolutely cannot touch.
  • Fabric softener is honestly one of the biggest culprits I see and nobody ever suspects it. It coats everything it touches, the tub walls, the drain hose, all of it, and just sits there getting rancid between washes.
  • Leaving wet laundry sitting in the drum for more than a couple hours, even just once, can kick off a mold colony between the tubs that takes multiple back-to-back cleaning cycles to fully knock out.
  • Running cold-water-only cycles for months straight lets bacteria thrive undisturbed, because hot water is your main line of defense against biofilm and you've basically taken it out of the equation.

Symptoms You May Notice

  • Your clothes smell musty or sour even right out of the washer, like they didn't actually get clean despite going through a full cycle.
  • There's a visible dark gray or brownish ring around the top lip of the drum right at the waterline, and it feels slick or slimy when you run your finger across it.
  • You get hit with a mildew smell the second you open the lid, before you've even put a single item in.
  • Black or brown flecks showing up on light-colored clothes or whites after washing, basically little bits of biofilm dislodging and sticking to your laundry.
  • The machine itself smells like a wet basement two or three days after you ran a load, even when it's been sitting closed and empty.

Tools Required for Diagnosis

Rubber glovesMicrofiber cloths (at least 2)Old toothbrush for agitator finsAffresh Washing Machine Cleaner tablets or OxiClean Washing Machine CleanerSpray bottle with water (for wipe-down)

Diagnostic Checklist

Follow these steps in order. We start with the easiest external fixes before opening up the machine.

Replacement Parts

If your diagnostic testing proves the component has failed, you will need a replacement. We recommend OEM parts over aftermarket for water-handling components.

Part Name
Affresh Washing Machine Cleaner (6-Count)W10535461 · $12–$15
Tide Washing Machine Cleaner (Oxi Plus Odor Remover)TIDE-WASH-01 · $10–$14
Glisten Washer Magic Liquid CleanerWM36N · $6–$9
OxiClean Washing Machine Cleaner with Odor BlastersOXI-CLEAN-WASH · $8–$12

Frequently Asked Questions

Why does my top loader smell like rotten eggs?
That smell is bacteria and mold growing in the biofilm that builds up between your inner wash basket and the outer tub. Top loaders are especially prone to this because people tend to use too much detergent or fabric softener, stuff that doesn't fully rinse away in cold water cycles. Here's the gross part: once that biofilm is established, it redeposits bacteria back onto your clothes with every wash. So your 'clean' laundry actually has bacteria on it. I pulled an agitator out of a machine last month that hadn't been cleaned in two years and honestly it was pretty rough in there. Run a cleaning cycle this week.
Is vinegar just as good as a commercial cleaner?
Vinegar does a decent job on hard water deposits, I'll give it that. It's a mild acid so it'll dissolve calcium scale reasonably well. But it's basically useless against heavy grease or the waxy buildup you get from months of fabric softener use. Commercial cleaners like Affresh have surfactants specifically designed to lift and carry that kind of residue away, the stuff vinegar just kind of sits on and gives up. Also worth knowing: using straight vinegar too frequently can degrade certain rubber seals over time. Use it maybe once every few months as a supplement if you have hard water, but don't rely on it as your main cleaner.
Do I need to use a cleaner if I only use bleach in my whites?
Yes, definitely still use a dedicated cleaner. Bleach kills bacteria on contact, but it doesn't remove the physical layer of soap scum, mineral deposits, and waxy buildup that accumulates in the tub. Think of it this way: bleach sanitizes the surface of that residue layer, but the residue itself is still sitting there, and mold and bacteria can grow right back in a matter of days. You need something like Affresh or OxiClean to actually strip that residue off the walls. I've seen machines where people ran bleach every month for two years and the outer tub was still caked with biofilm underneath. Bleach alone just isn't enough.
Can I use front-loader cleaner in my top-loading machine?
Most modern cleaners are labeled for both types, and they'll technically work, but top loaders really benefit from a formulation that can survive the high water volume without getting too diluted. A top loader dumps in way more water than a front loader during the fill cycle, so whatever cleaner you're using needs to dissolve slowly enough to stay active throughout the whole wash. That's why tablets are almost always the better choice for top loaders over powders. Powders dissolve fast, and some machines actually drain during the initial fill sequence, so you can literally lose half your cleaner before the wash even starts. Tablets for top loaders, pretty much every time.
How often should I clean my top loader?
Once a month is the standard and it's what I tell pretty much everyone. If your machine has a 'Clean Washer' cycle, use it every time because it's designed to maximize water temperature and fill level specifically for cleaning. If it doesn't have one, use the hottest water setting, the highest soil level, and the highest water level your machine allows on the longest available cycle. People who wash exclusively in cold water should probably bump that up to every three weeks because cold cycles don't inhibit biofilm growth the way hot water does. And if you've gone six months without cleaning? Run two back-to-back cleaning cycles.
Will these cleaners damage my septic system?
Affresh and OxiClean are both labeled septic-safe when used as directed, which means once a month. The reason they're safe is dilution. By the time the cleaner drains out of your washer, it's been mixed with 15 to 20 gallons of water, which takes the concentration well below anything that would harm the beneficial bacteria your septic system depends on. Just don't use them more frequently than recommended, and definitely don't combine them with bleach before draining, because that sends a significantly harsher chemical mix into your system than either product alone.

Models Known to Experience BEST-CLEANER Errors

This repair applies to most Generic washers with this error code. Common model numbers include:

Whirlpool WTW5000DW, Maytag MVWC465HW, GE GTW465ASNWW, Samsung WA50R5400AW, LG WT7300CW, Amana NTW4516FW, Speed Queen TR7003WN

MS

Written by

Mike Sullivan

Lead Appliance Repair Technician · 20 years experience

Last verified for technical accuracy on March 17, 2026