We recommend using a 'delicate wash' setting in a washing machine for Hot Pants and Hot Tops, with a drip dry.
Ever since I got my first pair of Hot Pants back in 2011, I used to hand wash and drip dry with mild detergent which also works (but was more of a hassle). It's quick and I still have that original pair!
Zaggora tested a variety of products on a delicate wash setting and after 500 cycles, they were all fine.
You can wash your Hot Pants and Hot Tanks/Tops as many times as you like.