Check the care label
Remove loose dirt with a soft brush
Spot clean stains with mild detergent and cold water
Fill a sink or basin with cool water and a small amount of gentle detergent
Submerge the cap and gently swish it
Gently scrub dirty areas with a soft cloth or toothbrush
Rinse thoroughly with cool water
Press out excess water with a clean towel
Reshape the cap
Air dry on a towel or cap form
Keep away from direct heat and sunlight
Do not use a dryer
Do not wring the cap
Do not soak vintage or cardboard-brim caps unless the label says it is safe