I washed mine in a standard washer/dryer for about two years before a pouch tore and it began to leak weighted material. I am still unclear if it was a washer/dryer damage issue or if my new dog with God damn demon nails poked a hole in it. I honestly think it was the dog.

Most should be machine washable in cold water on the gentle/delicate cycle without any addons (no fabric softener, certainly no bleach) before tumble drying on low, which you may need to do twice and could also be where I fucked mine up (I dried it on Hellscape Hawt one time.).