A clean dehumidifier makes a bigger difference than you'd think. Here's the most effective method, plus the mistakes most people make.
Always unplug the dehumidifier and disassemble removable parts.
Empty the water tank and wash with warm soapy water. Rinse thoroughly and let dry.
Most dehumidifier filters are washable. Rinse with water, let dry, and reinstall. Replace if damaged.
Use a soft cloth dampened with diluted vinegar to wipe the coils. This removes mineral buildup.
Wipe the exterior with a damp cloth and mild soap. Dry before plugging back in.