An alternative to handwashing your dope snapback to get the sweat stains out would be to put it on the top shelf of the dishwasher. If this is a cap worn for athletic purposes, this method is perfect. The shape will be slightly rounder at the top but it won’t matter because it’s going to get dirty again the next time it goes on the field anyway.
Before you soak your hat in warm soapy water, you will want to look at the material of your New Era 5950 cap. Most New Era 59FIFTY caps are made out of 100% wool or a wool/cotton blend. Wool and cotton shrink after you get them wet and they dry out. If your cap is made with wool and/or cotton and is already a tight fit, you might not want to try this method.
Always let your New Era cap dry out naturally instead using a clothing or hair dryer to help minimize shrinking, and to help maintain the shape of your cap.Deep Dirt/Ink/Paint Stains: Unfortunately, there’s not really any safe way to get these stains out of a discount hats without compromising some of the color or stitching due to extreme chemicals and scrubbing required to get some serious stains out.
Again, light color cheap caps have these types of stains more often because the stains standout more against the light background and they’re harder to completely get out.
With something serious, like an ink stain, on a white colored hat, it’s best to go with a “one-two punch.” That is, give it a good soapy scrubbing in warm water dilute the stain, then hit with a direct drop or two of bleach directly on the stain. Repeat this as many times as needed, but sometimes, there’s nothing you can do to clean a stained cap, without ruining it in some other way.