Hi... In RV parks there are row after row of Class A's. They always look like they just drove off the showroom. How do you do it? I never SEE anyone washing their rigs yet they are always clean....
I use a small 2 qt hand pump pressure garden sprayer to wash/rinse windshield and microfiber & squeegee on windshield and front of coach. I use few TBSP of vinegar + a few drops of Meguiers yellow wash & wax soap from Walmart in the sprayer.
You can also use the sprayer to wet down sides and squeegee dry. Never had a complaint at a park using this method.