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there is no procedure for "fixing" used pads. it is a chemical bonding that occurs between the pad and rotor. that cannot be scrubbed off with any assurance of success. in over 30 years of doing this, i have seen less than a 50% rate of success. it is worth a try, as you have nothing to lose, but likely to fail.
at my shop i made a fair amount of money fixing this on cars that people had done "pad slaps" on, or failed to properly bed pads. once you have uneven deposits, you are basically screwed. these are essentially "hot spots", which do not react to the coeeficient of friction evenly. essentially the pads are "skipping" across the rotors, as they encounter the areas of higher and lower coeeficients of friction. i cannot count the number of bets i have one with guys who were "sure" that they could do it halfway "because a buddy told them they could, and he never had a problem".
again, consult the stoptech site on this.
start with a good baseline. new pads and rotors, bedded properly. if any of those are not in the equation, the result will almost certainly be less than desired.
and before anybody says it, no, the rotors are not warped. rotors almost never warp. that is an urban myth. i have seen exactly 1 warped rotor in my life, and it was from a frozen caliper.
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