Wash them as normal with your other clothing! Wash cold/warm and tumble dry low.
Baseball Shirt: We suggest for the black and white baseball shirts to wash separately on the first wash and do not air/hang dry or bleeding may occur.
Stain? Try oxy clean to get out any tricky stains.
Baseball caps can absolutely be washed. Throw on a delicate cool wash and air dry. Better yet, if you can find a small ball to dry the cap on it will keep its shape even better.