A slimy substance can coat the bottom and sides of a dehumidifier reservoir. Bacteria and mold spores from the air are the cause of the slime that develops. If left to continue to grow, the slime can begin to have a rancid aroma. The slime cannot be prevented. However, frequent cleaning can remove and prevent the slime from building up and causing an odor.
Unplug the dehumidifier.
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Remove the reservoir and discard the water.
Fill the reservoir with hot water and dish soap.
Wash the reservoir with a soft cleaning cloth.
Replace the reservoir and plug the dehumidifier back into the unit.