We normally don't tip on trash and towel day. I will tip on full cleaning day, around $5-$10, depending on the room. If its really messy, closer to $10. But, one time we had a wonderful housekeeper who adored my DS and would leave him towel animals, even on our non service days. He was so tickled by those little towel animals, on our full cleaning day, I left her $20. It's totally up to you, however you see fit. But, I never base my tip percentage, or whether I leave one or not, on what I think they make an hour.