[header] How to clean a white hat [title] Examine the hat. [step] Before you decide to wash a white hat, you should carefully examine it. Look at how the hat is stitched, at the headband, and at the brim. 
If the hat appears to be constructed of quality material, has durable stitching, and has a plastic brim, it is a good candidate for washing. [substeps] Do not attempt to wash a hat with a cardboard visor.