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hippy
Some Shimano rotors are marked “resin pads only” - could compatibility be a factor?
https://shimanobikes-nz.prontoavenue.biz/ts1570079501/attachments/Page/20/Disc%20Brake%20Pad%20Compatibility%20Chart.pdf
In any case, once the pads are contaminated, if it is something that penetrates the pad, no amount of cleaning will help and some solvents seem to just distribute whatever the contaminant is even deeper.