hardest thing on electrical system ?

The soap at the car wash is pretty caustic. As a teen I worked against gas station with an automated wash. One of the jobs was to keep the soap filled I started filling it and a customer came and had to stop. So I set the container I the front fender of my car. Well things got bust and I eventually got back to filling the soap. But never noticed the ring of soap on my car until tend to day. When I washed it off it left a prefect ring of missing paint. Now diluted it is not as bad but it does have gone pretty strong to get the bugs and dirt off in such a short period of time without actual physical contact.