I always wash my own cars.. unless on the odd occasion I am running late, and my car is filthy!
A few days ago.. I had to wash the car in a hurry, and as it was soo hot and I didn't want to get sweaty.. I thought I would take it and have a quick rinse at one of those hand car wash places.. I pulled in.. and saw a newish C Class.. having its go... the "expert" was standing at the rear side of the car.. the boot was open.. and he was Jetwashing the top boot seal!!
he then with one hand pulled out the corner of a piece of plastic apparently protecting the boot carpet.. no chance of water falling off the end and into the boot electrics then?? Der! I didn't bother, I drove straight out.. went home and washed it myself... If you want something done properly...