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Shartacular Spectacular
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If the piss is ineffective, work human feces into the stain by hand using a circular motion while applying a moderate amount of pressure. Though the more laborious method, it’s the only surefire way of removing the exhaust stains from that rack. The key is the chemistry facilitated by the enzymes created by the coliform bacteria breaking down the carbon chains in the exhaust soot. It’s science.

Let us know how it goes.
 
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Cycologist
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Next time by the black one instead of the silver one.
 

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If your exhaust is leaving black stains, you should probably figure out why your car is running rich...
 
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Shartacular Spectacular
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443 Posts
My urine is too corrosive. It will eat through metal like butter.

Thanks for the tip but I am looking for a different solution.

Sent from my SM-G965W using Tapatalk
Read as "Urine won't work, but I haven't ruled out the feces method...".
 
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