As everyone else is already saying I machine wash my Diesels inside out in the delicate cycle if specially dyed, on cold/cold. The thing I do different is to throw them in the dryer after I let them air dry. I do this because they get all stiff if you just let them air dry and the dryer softens them up. Their is no risk of them shrinking from this since the cotton is no longer wet, but you may want to watch out if they are coated (not just dye treated) for that may come out. The thing about clothes is that there is no one best way to clean them since it depends on each individual garment. Some clothes shouldn't be cleaned with the perc and are best left to be washed. Then there are even those items that can't be cleaned at all. Just use your best judgment.