Dishwasher not cleaning dishes properly? Here's why

A dishwasher that leaves dishes gritty or cloudy is one of the more frustrating appliance complaints, mostly because the instinct is to blame the detergent and try three different brands before considering that something mechanical might be at fault.

Check the filter first

Most dishwashers built in the last decade have a removable filter basket at the bottom of the tub rather than a self-cleaning system. Unlike older dishwashers, these need to be pulled out and rinsed by hand periodically. A clogged filter recirculates dirty water throughout the cycle, which explains grit on dishes even with a working detergent.

Look at the spray arm jets

The spray arms have small holes that direct water onto the dishes, and those holes clog with food debris and mineral buildup over time. A toothpick or a dedicated cleaning tool can clear visible blockages; if the arm doesn't spin freely when you nudge it by hand, that's worth mentioning when you call.

Consider your water hardness

Fort Bend County water runs on the harder side, and hard water leaves a chalky film on glassware that looks similar to a cleaning failure but is actually a mineral deposit issue. A rinse aid formulated for hard water often resolves this without any repair at all — worth trying before booking a service visit.

Water temperature matters more than people expect

Dishwashers rely on water arriving hot enough to activate the detergent properly, generally around 120°F. If your water heater is set low, or the dishwasher is far from the water heater, the water can cool in the line before reaching the machine, leaving detergent under-activated.

When it's a mechanical fault

If the filter is clean, the spray arms turn freely, and hard water doesn't explain it, the more likely causes are a wash pump losing efficiency or a water inlet valve not delivering a full fill. Both are diagnosable in a single visit — see our dishwasher repair page for what that visit typically covers.