GT3 Front brake pads
#16
In my experience track pad deposits wont' just go away with use. Street pads aren't abrasive enough to clean the track pad deposits off. You may have to get a rotor hone and use it with a drill to clean the surface and re-bed your street pads fresh.
https://www.amazon.com/Brush-Researc.../dp/B007SOW0WC
https://www.amazon.com/Brush-Researc.../dp/B007SOW0WC