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in my experience, once you have pad deposits, it doesn't matter if they are hot or cold. End a track day with deposits and vibration, let the car sit and completely cool down, then drive off - the vibration will still exist. You have to get the deposit off the rotors. If you are using OEM, it will be very difficult to do that without some intervention. Either take off the rotors and clean them by hand, or put on a more aggressive pad and let them slowly scrape off the deposit. A track pad is very aggressive when cold and will clean the rotor quickly. And no scrubbing or removing the rotor.
This is my process
1. Start with clean rotors and use OEM pads for street use.
2. Day or so before a track event I put in track pads. A couple days worth of street driving will clean off all the OEM pad material
3. Bed track pads.
4. Tear it up at the track
5. Keep track pads on for a couple days after an event. When they are cold, they will self clean the rotor of any deposits
6. Swap back to OEM. Bed if you want to. I don't
7. Next track event - repeat.
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