How to Use Dishwasher Cleaner | Step-by-Step for Every Brand

A clean dishwasher is the difference between glasses that sparkle and glasses that come out cloudy with a faint smell of last week’s fish. And the process is almost too simple: pop in a tablet or a liquid bottle, run the hottest cycle, and forget about maintenance for another two weeks. Most people overthink this — they scrub seals, run empty cycles with vinegar, or ignore it entirely. The real fix is a purpose-made dishwasher cleaner used the right way, and that takes about three minutes of work.

How to Use Affresh Dishwasher Cleaner (Tablet)

Affresh tablets work best when placed in the detergent dispenser for an empty load. Start by removing any large food debris from the filter and drain area — a quick rinse under the faucet is enough. Drop one tablet into the closed detergent cup, close the lid, and run a Normal Wash cycle on the hottest setting. For a machine with heavy buildup or standing water, use two tablets: one in the dispenser and one tossed loose on the bottom of the machine. The second tablet scrubs the sump area where sludge collects.

How to Use Finish Dishwasher Cleaner (Liquid Bottle)

The Finish liquid bottle is the most common type you’ll find on grocery store shelves, and its instructions differ from tablets. Leave the cap screwed on tight. Peel off the sticker from the top — underneath is a wax plug that melts during the cycle and releases the cleaner. Stand the bottle upside down in the bottom rack so the wax plug faces the spray arm. Remove all dishes and silverware, clear the filter, and run a Normal Cycle on the hottest temperature setting. Do not add detergent or a rinse aid when using this product. After the cycle finishes, the empty bottle is ready for recycling.

How to Use ACTIVE Dishwasher Cleaner (Foaming Tablet)

ACTIVE tablets also go in the detergent dispenser tray with the machine empty. Drop one tablet into the closed dispenser, shut it, and run a normal hot cycle. If grease or mineral deposits are visible, add a second tablet to the bottom of the tub — the foaming action from two locations will strip the interior clean in one pass. Air dry the interior when the cycle ends, and repeat monthly if needed for hard-water areas.

How to Use Dishwasher Cleaner on a Bosch Machine

Bosch’s own guidance is slightly different from other brands: drop one box or tablet of cleaner loose into the bottom of the empty dishwasher — not the detergent dispenser. Then select the hottest, longest cycle available. Bosch machines use a self-cleaning filter system that benefits from the longer wash time, so the extra minutes make a real difference. This method applies to standard Bosch and Thermador models alike.

Frequency and How Often to Clean

The consensus across appliance manufacturers is once every two weeks, or roughly every 30 loads. A 24-count pack of tablets buys you a full year of maintenance for about $8. If your water is hard, you drain standing water from plates regularly, or you notice a sulfur smell, bump the schedule to once a week for a month until the odor disappears, then settle back to biweekly. A deeper cleaning with a descaler or powder once every six months handles mineral buildup the tablets might miss, but the every-two-week tablet schedule prevents the worst deposits from forming in the first place.

Dishwasher Cleaner Comparison: Tablets vs. Liquid vs. DIY

Common Mistakes and How to Fix Them

Standing water after a cycle — this means the drain or filter is blocked. Remove the bottom rack, take out the filter (check your manual to confirm it’s removable), rinse it under warm water, then run a cycle with two tablets: one in the dispenser, one on the bottom. That double dose usually strips the clog free. Blocked spray arms — pull off the upper and lower spray arms and poke a toothpick through each nozzle hole. Food particles wedge in there and divert water pressure. Cloudy glasses after cleaning — that’s limescale or detergent residue, not a dirty machine sign. Use a liquid cleaner or a descaling tablet rather than a detergent pack for the maintenance cycle. Exterior damage on stainless steel — abrasive sponges scratch the grain. Wipe the front panel back and forth in the direction of the grain only, using a microfiber cloth with a stainless steel spray designed for appliances.

DIY Alternatives: Vinegar and Baking Soda

White vinegar works well for light maintenance but won’t strip heavy buildup the way a commercial tablet does. Fill a dishwasher-safe glass or cup with two cups of white vinegar and place it upright on the bottom rack. Run a regular cycle with air-dry or energy-saving dry — no detergent. When that cycle finishes, sprinkle a cup of baking soda across the bottom rack and run a short hot-water cycle. The baking soda neutralizes any lingering vinegar smell and polishes the interior. This two-step method is more work than a tablet, and it costs about the same per use. Reserve it for the months when you run out of tablets and need a stopgap.

If you suspect hard water or limescale buildup is the root of your dishwasher’s bad performance, a purpose-made commercial cleaner — like the ones we rank and compare in our guide to the best cleaning dishwasher detergents — will outperform any DIY method on mineral deposits.

Quick-Reference Checklist for a Clean Dishwasher

That’s the whole routine. Fifteen minutes of attention every two weeks keeps the dishwasher running like new, prevents the sulfur smell that develops when food sludge ferments in the drain, and saves you from scrubbing spray arm nozzles with a toothpick every other month. Use whatever brand tablet you prefer — the key variable is the hot cycle and the consistent schedule, not which label is on the box.