A five-minute filter check is the best piece of preventive maintenance you can do for a KitchenAid dishwasher, and skipping it for months at a time is the single biggest reason dishes start coming out with visible food residue or a cloudy film.
Finding the Filter
Slide out the lower rack and look at the floor of the tub, usually toward the back or in one corner, for a round or cylindrical component that twists free by hand — most models mark the unlock direction with a small arrow or icon molded into the plastic.
Separating and Rinsing the Parts
Many dishwashers use a two-piece filter: a coarser upper cylinder that catches larger particles, and a finer mesh screen underneath that traps smaller debris. Separate the two if your model allows it, and rinse each one individually under running water, using an old toothbrush to work loose anything stuck in the mesh.
Look Past the Filter Itself
With the filter out, take a moment to peer into the sump opening beneath it. It’s common to find a stray piece of glass, a fruit sticker, or a small bone that never made it into the filter in the first place and has been sitting in the sump instead.
Seating It Back Correctly
Push the filter back down and twist it until it locks — most models give a distinct stop or click. A filter that isn’t fully seated can rattle during the cycle or, worse, allow debris to bypass it entirely.
A Realistic Schedule
Checking monthly is a reasonable baseline for most households, though kitchens that don’t pre-rinse dishes before loading benefit from checking every couple of weeks instead. If cleaning the filter doesn’t resolve a drainage or cleaning complaint, visit our KitchenAid dishwasher repair page.