I'm getting long in the tooth and have bad shoulders, so I have trouble hand washing the car (leased 2017 C-300 coupe). However, I still would like to wash sort-of by hand and was thinking that maybe something that attaches to my garden hose would at least do as good a job as the commercial soft-brush car wash. I do use sealants, but that is only a couple of times a year; whereas, car washing can be several times/month. Any suggestions?