I had given some thought to a nude laundromat so you could get 100% of your clothes clean. When you wear clothes to the laundromat, as soon as you get home, you have clothes that need to be washed.
I don't think many will feel comfortable being nude at a laundromat, however, you make an excellent point about also laundering the clothes you were wearing coming in.
So instead, let's adjust the business model to lend out bathrobes. So you can come into the laundromat, disrobe in a changing room and change into a clean bathrobe supplied by the laundromat. You can then lounge around in a bathrobe and slippers while your laundry is being done and maybe we can have some "private" rooms for rent with a bed, jacuzzi and a TV - rented by the hour of course.
This could change the dowdy image of a laundromat overnight!