I wash mine once a year in the spring. Can get away with just one was because my horse rotates through 3 sheets/blankets depending on temperature. I initially wash in wash rack scrubbing with plain water and a broom to get the worst of the grim off. Then after it is dry I take it to my local laundromat (I have been going for yrs and have yet to be refused to allowed to use the largest machine). I use Rambo wash and then hang to dry. All my straps come off and I wash them by hand. The place where I see a lot of people go wrong is that the leave dirty blankets hanging up all summer and then shake them out and use dirty blankets the next year. It’s 100 degrees in Texas in the summer. That plus constant UV plus bugs does not equal long lasting blankets. Yuck!!