When you’ve reached the end of your tether, asking nicely hasn’t worked, and nagging falls on deaf ears, the only thing left to do is pretend that you work in a hotel. This husband is obviously fed up with his wife leaving foundation stains all over the towels, and it sounds like he has asked her several times to stop.
This kind of “Housekeeping Management” note would definitely make me stop and pay attention, not least because I’d be torn between laughing and fuming. The new brown towels are a nice touch, though. Perhaps he’s in charge of purchasing from the hotel as well.