Rub a lint roller over the hat, or wrap a piece of masking tape around two fingers with the sticky side away from the fingers and rub over the cap. This removes dust, pet hair and other loose buildup that accumulates on the cap.
Spot-clean with a damp cleaning rag.
Drizzle about three drops of laundry detergent onto the damp rag, and spray a mist of stain-removing spray on the rag.
Wipe gently across the interior sweat band, where most dirt and stain residue builds up. Continue across the cap until you remove most if not all of the buildup.
Rinse out your cleaning rag, wring out and wipe over the sweatband to remove soapy residue. Let the New Era air dry.