Not raging. They have no idea that it could have damaged the paintwork - it hasn't - no damage done. They know now though.
Was just intended as a lighthearted joke. No point in going mad about it. I value my daughter's feelings more than I value my car's paintwork.
My daughter does know how to wash a car properly - she's seen me do it enough time. The other half has no inclination to start learning how to hand wash a car.
I would not let him within 3 feet of my car to clean it. It would end in a scratched car and divorce (if we were married).