This stomping you're doing is more stress on the clothes than a proper hand wash. (And if you're going to be anal, that's what they want you to do. Hand wash. Not foot wash.) Also, what exactly is in your shampoo? Or your conditioner? How do you know those chemicals are not damaging the properties of your clothes? Further more since you're not really soaking things with a proper detergent then I'd be wary of bacteria on the chamois.

Call me +4 for gentle cycle, front load, hang dry.