1. Separate white clothing from non-white clothing. 2. Place white clothing in washer and add soap. 3. Place white clothing in dryer. 4. Place non-white clothing in washer. 5. Remove white clothing from dryer. 6. Place non-white clothing in dryer. 7. Remove non-white clothing from dryer.
That's all they're doing for people besides giving them a little soap. It's about 5 minutes of work, so around $300/hour if they're efficient, assuming one bag per customer. This is a scam YC if I've ever seen it.