Search results for washing-device-for-baseball-caps are below:

https://www.ballcapbuddy.com/

The original hat washer, Ballcap Buddy, is the best way to clean and store your ball caps. The hat washer lets you wash a cap while retaining its shape. You can even wash your hat in a washing machine or dishwasher! -Ballcap Buddy

Proudly made in the USA since 1992. -Ballcap Buddy