Can you wash restoration hardware slipcovers in the washing machine?

I just go finished washing our RH linen slipcovers in the washing machine and they came out fine! I have a front loader and washed on the "Wool/Hand Wash" cycle in cold water with detergent and oxyclean. Layed flat to dry and put everything back on before it was completely dry. Looks great. BTW my cover's labels specifically said Do Not Dry Clean.