Do not place in a washer or dryer. Clean by hand just like leather boots. Our product is sealed with professional grade leather vinyl sealant, but this does not protect the hat itself, and will not protect the leather from certain chemicals.
Genuine leather patches should not be cleaned at all but if need to, a damp sponge can be gently used.
The hat and inside and sweatband area can be cleaned with mild detergent. You can use a soft brush to spot clean those stubborn areas. Never put hat in washer machines, dishwasher or put in dryer, (too much heat may lift adhesive on patch) air dry after cleaning.