So, i was cleaning off a pair of rotors for spartangl, and these were 65k rotors. They were in good shape, no nicks or anything. I soaked them in a hot soapy water solution for 30 min, came to check on them and this is what i found. No chemicals were used in this process. Also, no tools other then my hands were used in this process. I want to point out that all the guys saying water meth is to blame are probably wrong. Like i was telling everyone before, the factory coating is flawed, they just didnt prep it correctly. Enjoy.
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