freshy... were there any signs in the carwash saying about spoilers?
even if there were a sign saying about spoilers, as your car has a factory fitted spoiler (making it standard??) then it could be argued that this was not a reasonable exclusion clause.
Maybe you can ask the garage to give you proof that the required maintenance or manufacturers servicing maintenance was in date. Also, maybe you could report this to trading standards?
you could write them a letter, something like this ------
On Sunday 15th April, I used your car wash. Whilst in the car wash there was a malfunction that has caused extensive damage to my car. I have details of two independent witnesses who saw that the spinning brush crashed through the back of my car causing the window to break.
The cost of damage to my car is £??????.
Whilst I do not want to cause inconvenience to yourselves in pursuing this matter within the Court, I feel that I am left with no other choice as I have been informed by the manager at the site that you do not accept responsibility for this.
Unless you make payment in respect of the damage caused, I will have no other choice than to take legal action against yourselves and pursue this claim through the small claims court.
Please note that if I do not hear from you within seven days from the date of this letter, then I shall start Court proceedings to claim for the damage caused plus an additional payment for expenses that I have incurred as a direct result of your negligence / faulty equipment.
PAY UP... OR I WILL TAKE YOU TO THE CLEANERS