I've got a set of DHB's with just 4 HC. When my RR's are done after 2 (hopefully) more track days, I'll be moving to them, and they will be cleaned and prepped with Keyser tire cleaner and then Hot Lap.
I'll keep documentation, as I usually do, on track conditions and longevity.
I won't have a baseline to tell you how much further the same set would have gone without cleaning and prep, but maybe posting pace, track, conditions and total laps will be worth something against the standard use consensus if there is one.
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