Theckie, Eric H & others,
We had basement sealing with tar concrete company that we caught red handed. In hindsight ... I would have locked them in the bay(indoor locks) until someone authorized from the company agreed to pay or emergency cleaned it up themselves. It was that bad & even all over the two 10'x10' Alaskan PolyCarbonate
doors. Brand new hogs hair foam brush 100% filled with the worse tar imaginable! As far as I am concerned they did permanent damage. We finally got an inadequate payment from the contractor with the partners who were not there when it happened. They tried to ignore us 100% but finally I got their attention with "some lengthy name dropping" that I rarely use & a call from our city attorney's office to them that the city attorney's office initially did not respond either! BTW 100% proof from hi resolution pictures were provided. I did not get a civil court or get my insurance company involved ... I am not sure where that would have turned out. Others may comment on me avoiding that path ... if they survived the ordeal & are still in the car wash business.
Good thing I did not have a loaded revolver like Mac & some of the others on this forum carry ... on me when I my employee told me of what was going on & it appeared they were about to leave & approached them. The idea that "it was our responsibility to clean up after every customer regardless of the horrific-ness of the mess" blatantly put to us ... made this one of the worse experiences that we ever had. It has had lasting effects when it comes to my awareness of "deep state" potential horrors at every level of government & accompanying potential cronyism abuses etc!
If I remember right we did somewhat salvage the brand new 4" Erie Hog Hair rectangular brush by soaking it thoroughly in diesel fuel which is very similar to Kerosene that Eric mentioned.