Well RYR are getting rid of their b732’s soon and replacing them with-800’s. The reason RYR don’t wash theyre planes is because they don;t have time. Sure down and up agin in 25 mins. hardly time for a wash!
The fleet effectively sleeps for arounf 5-6 hours during the night. Plenty of time to wash them. Other airlines manage it. EZY, BMI baby, Jet Blue, Southwest etc