We average about one trip a month that ranges from 7-10 days. The motor home NEVER leaves my yard unwashed. The roof gets washed every other trip (lots of dust in the area). The front 3M bra gets gently washed with microfiber and 303 applied every trip. The coach gets completely waxed 2-3 times a year and the lower half gets waxed 5-6 times a year. I wax the Onan generator once a year.
I use to be able to wash and wax the coach in one day. Now at 58 years old and a 40' long by 12' tall coach, it now takes me a couple of days to wax.
I recently bought the Costco portable water softener and use it for washing the coach. I wash the coach with soap, rinse with regular water and then do a second rinse with the water softener. I still dry the lower half with a towel, but the upper half now drips dry and doesn't spot. The water softener saves my knees....no more climbing up and down a ladder to dry the coach.