The circulator can be wiped with a damp cloth. Avoid placing the unit fully in the water and never deliberately place the unit under water when plugged in. Remove the cover for the heater element by twisting anti clockwise gently. The stainless steel element can be washed by hand with detergent or placed in a dishwasher. Take care not to lose the clear plastic pump cover that protects the propeller blade. If the element becomes coated in limescale it can be de-calcified by using a proprietary cleaner or using the circulator in water containing a weak vinegar solution. Check for signs of damage after use and never use the machine if the cable is damaged or any part of the casing is damaged or loose.