Portable RV washing system

[vipermanden]

Anybody out there have experience with using a portable pump, that can run off our electric outlets when having the generator on? I see all kinds of wimpy 12V setups on Amazon, but they get huge dings in their reviews. I was hoping to find one that is electric, and can draw from a 5 gallon bucket, and has 20+ feet of hose, so i can spray the top of my RV. The reason for all of this, is most campgrounds, don't let you wash your RV, and the storage facility where I store it has no electric or water supply. I can soap the RV down with a brush, but need a way to rinse it after soaping it up.