Wax the shower
. If your RV has a skylight in the shower, you can prevent a large amount of sun damage to the shower walls using a product that includes an UVA shield..I use such a wax ( can't tell you the brand, and its 3200 miles away) If you rinse the walls down, then wipe them with a course microfiber towl after shower, they will remain "almost" as new for years.. Mine are at 10 years and still looks great. The floor is another matter, as slipping is a concern..A between shower floor mat is our solution...rgr...
2004 Winnebago 33V, WH
2010 Honda CRV
Jim, Lynda, and our 6/2010 model Weimaraner, Quincy, aka Q Man