[rich g]

Hi All,
I installed a sprinkler system and what I was afraid of came true, my car has developed a nasty yellowish runny stain that I dont know how to remove. I am pretty sure it came from the sprinklers but not 100% positive.

I can take pictures if need be but I was wondering if anyone had any suggestions for removal.

I have tried
Washing, and using distilled vinegar to no result..

I was thinking about using goo-gone but wanted advice from the experts first.

Any help is appreciated!

Thanks
Rich