When a completely dirty woman comes in let let her use the washing machine. You can cancel the wash early and "wash her yourself (static image)". After they're done, you demand money and you'll play with them (static image). I couldn't find any other NSFW stuff.
After either washing the girls yourself or cleaning the using the machine, demand money and then when they offer to let you feel them up, tell them you still need money for a scene.
You can also bang the dirty people by letting the washer timer hit 200, and then selecting "I don't know" when they ask why you didn't stop the washer.