Hi all,
This is my first post on this site , I am waiting for my white limited with tech package, my dealer is getting it from another dealer .
But onto the wash info...
I used to go to car washes , fist brush, then for years brushless .
Now the brush ones do scratch your paint over time and will destroy your clear coat, then paint over time.
The brushless ones do give your vehicle a nice sandblast effect over time and they do destroy your clear coat then paint and especially that fake chrome that car makers use, I had a 300m and wondered why my fake chrome was looking like shi* , and I figured it out, the sand blasting from brushless car washers .
Since then I only wash by hand, I find rainy days that are kind of warm to wash them in the winter or I live with the salt until I find one, but now I have a garage and wash them with no rinse soap (no rinse soap is a mixture of the soap and water, then dry immediately ) then use spray wax right after.
Now if the car has lots of salt, I wash off the salt with a very soft micro fiber mitt in another bucket of water before I continue , that way I do not scratch any paint.
As soon as I get some rain or warm weather, I take a hose to the underneath
This is what I have found, you do as you like, it's your vehicle and your money.
Best of luck.