We recommend washing the topper every 10-14 days. A good indication is when either the hair becomes very dry or the cap begins to smell unpleasant.
The shampoo should be sulfate and silicone free, and the conditioner as rich as possible. For treated hair, the conditioner may be happy to silicone - but never applied to the cap. All silicone-containing products should be kept away from the mount, they can otherwise trigger hair loss.
Untreated hair (not bleached, completely intact cuticle) can also be cared for without silicones. the care products should not have any aggressive ingredients to guarantee the longest possible shelf life.