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I wash my van maybe every 3-4 weeks. Of course it depends on the road conditions.
I always wash it myself .....
At home, I sponge it by hand and use a pressure washer to rinse it. I like taking time to rinse under the wheel wells .. tires, brake components, tie rods, etc ... as much stuff as you can reach.
On the road, I'll use a self service car wash. Here's the trick that's gonna save you some $ .... you do not need to continuously feed the machine while you're washing. The only way to get it clean is to use the long brush. You'll spend the majority of the washing time brushing. So here's what you do ..... you only need to use 2 settings on the machine - 1.Rinse & 2.Foam brush. Feed the machine the initial cost for one cycle, whatever that amount is ... let's say $2 for 2 min. During that first 2 min, quickly rinse the van with clean water (30 sec), then spend 90 sec applying foam to the van. You're simply applying soap ... don't worry too much about covering every single square inch. Make sure to get more foam along the top portion of the van, it'll slide down and be useful. When the machine turns off .... spend the next 10 min scrubbing the heck out of your van. Try not to let it dry out too much ... doing this when the sun is down helps. When you're finished scrubbing, feed the machine another $2 & rinse thoroughly. Total cost = $4![]()
Another thing I do .... when cleaning my front windshield at truck stop, I often clean the roof portion above the windshield, the side mirrors, the front headlights & whatever else looks terrible .... use the squeegee for all that stuff. It's ok ... it's free & doesn't take too much time, you're basically keeping trouble spots clean. The side mirrors on Sprinters stick out like elephants ears & if bugs dry on them for even 1 day they become very stubborn to clean.
Hope that helps ....
Oh, next time you pass through ND on 94 there's a Tesoro station in Jamestown that I absolutely love. It's right off of 94. In the diesel lanes they have a huge plastic wash basin, maybe 2-3 ft wide, filled with super soapy water and a full size broom sitting in it. You can literally wash the entire front of your van while you get fuel.
Idk .... I personally wouldn't use gunk engine cleaner on any exterior surfaces. I've used it to clean & decrease engine parts. I think it's too corrosive on exterior components, especially anything containing rubber ... bumpers, side mirrors, etc ...
Side note: I've never used a single drop of wax on my van in 600K mi; other than some rain x on the windshield.