I’ve used a Brush Flex hone on my race car rotors. This has been effective at removing pad deposit, and allowing pad manufacturer/compound change without wasting a bunch of track time trying to get the rotors to take a set to the new compound. These should be effective at eliminating mild pad buildup, displaying as “warped rotors”.
I’d highly recommend doing this on a bench and wearing respiratory gear and eye protection. I wouldn’t recommend breathing in the resulting dust.
Link to amazon product listing
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1