thats the problem with this country any idiot can open up a garage without any type of qualifications, and in this day an age the physics are more applicable with the advances in technology.
I take it the garage that you took it to was either a back street workshop or a fast fit centre. personally i wouldn't allow them to clean my car,
there should be legislation so that every garage technician should have a minimum of a level 3 NVQ or equiv,
I hate wanna be's, and uneducated (Technicians if you can call them that). they potentially could of KILLED YOU.
glad your not going to use them again.