YOu have two options in Las Vegas
On the north side of the city is... as I recall.. A Pilot/Flying J station. and roughly across the road from it is a Blue Beacon. They do a fantastic job and are very well trained in how to wash an RV. I've used a few BB's over the years and happy am I.
Many campgrounds in Vegas will have a business card or 20 on file for a Mobile RV wash company. They bring a tank of water with a high pressure pump and also do a good job... I tend to like BB better but.. .the price is about the same.. about 2 bucks a foot as I recall but please. please do not quote me on the price.
Home was where I park it. but alas the.
2005 Damon Intruder 377 Alas declared a total loss
after a semi "nicked" it. Still have the radios
Kenwood TS-2000, ICOM ID-5100, ID-51A+2, ID-880 REF030C most times