Went to a fundraiser car wash for an auto tuning shop. They specialized in drifting vehicles but also carry alot of mods for other vehicles. Well there were alot of vehicles getting washed, minus mine (I just donated and turned down the wash), BMW's, Infiniti's, Lexus's, some really nice cars. Well while in mingle mode I ventured over to the car wash station and saw nothing but two 5 gallon buckets with water so dirty it looked like a mud puddle and terry cloth towels. No sight of a mitt, sponge, or anything. One of the guys even dropped a towel and just rinsed it off and threw it back in the bucket. I was thinking, "man that terry towel is probably filled with sand and rocks and now the bucket is too". I wanted to go school them on the proper way but I'm sure outside opinions were not welcome. I went with a large group and after listening to my advice most of them also turned down the wash. So at least my friends common sense prevailed.
Oh yeah, years ago I saw my sister-in-law scrubbing her Chrysler New Yorkers roof with a wire bristle brush. My wife got her to stop but the damage was done. Thankfully it was a beater, lol.