If the company have admitted to you that nobody checks the car wash, and no-one is trained on it, then this is in effect an admission of liability, IMO. Is there a sign saying the public use it at their own risk? Not having trained staff sounds like a breach of Health & Safety Regulations to me, they have a duty of care to their customers. Go and see that no-win no-fee solicitor - it's not a complaint you're making, you want to claim against their Public Liability insurance for negligence in their duty of care to their customers. It has had a lasting effect on you. Have you been to the doctor? Medical evidence of your fearful state would help.