You only need to clean the wetting strip if the water flow is blocked by excessive residue.

Clean the wetting strip:

1. Remove the wetting strip from the water tank. Rinse it thoroughly and rub it with a dry cloth. 
2. You can also let the strip soak overnight in a solution of 1 part vinegar to 3 parts water. Rinse thoroughly after soaking and rub it with a dry cloth.

Ordering a new wetting strip:

You can order a new wetting strip under type number CP0178/01.