Hi there,   As Joy says, that should be sufficient, but it is important to note that cat dander is one of the most persistent allergens. It can stick around for months or even years after a cat no longer lives in a place.   Definitely, you'll want to steam clean any curtains, cushions or carpeting that you don't remove, vacuum the entire RV with a HEPA-filter equipped vacuum cleaner, and wipe down all hard surfaces. Be sure to remove all dust, because dander collects in dust.   And don't forget to change out any heater vent or air conditioner filters too!   To your health & motor home happiness, Kathi