I wash my shorts, jerseys and underwear all in the regular wash (delicates, cold) but hang them up to dry. I've never had a problem and the garments stay nice. I've washed them in the shower but only when travelling and I don't have a washing machine handy. Assos makes a wash product that is good to use on trips.

PS: I have alot of shorts so I wear once and wash. Best to have 3 pairs to rotate. Watch for sales and buy when the price is right.