This tip was given to me by one of the campers at the campground we are staying at. I don’t know how effective it is but it made sense to me so I will share it.
Only For Porcelain Toilets…I Think
This is only if you have a porcelain toilet in your RV. Drain the water completely out of your toilet. Wax the entire interior of the bowl with Turtle Wax. Refill the bowl with water. According to the camper that gave me this tip, once your bowl is waxed with Turtle Wax (I guess any wax will work) cleaning any stains on the interior of the bowl will become super easy and will wipe right off.
Hey, it sounds good in theory, right? Let me know if you have tried this and if it actually works.