No offense but my car is only a 1.4 Astra, 07. I do it myself, even though I can easily hand it to a guy who comes round to my work place weekly (and he does services as well) for £15. Just too much of a risk if they get a single stone on the sponge (1 stone which is then used to clean a single panel = scratched like field rented goggles). Not to mention the attention to detail of a 13 year old will be poor, I doubt he would think to do under the wheel arches or the nooks and cranies of the front grill or the gap between the body of the car and the front windscreen.