FWIW I wanted to post an update on my experience.
Purchased 4 new BFG TAs in May 2020. P235 and P245 60R15s. I noticed that the raised white letters were not very bright that summer, and worsened by the following summer. Researched best methods to clean via interweb, and discovered many threads about this well known problem.
Car was in storage over the winter, so I called Michelin last spring, and was given a case number. Followed through with local authorized tire shop, and after a couple weeks I got the OK. They covered everything, including mointing, balancing.
Mine were 2 years old, 650 miles.
Guys at the shop showed how I could sand clean, but they used a neumatic circular grinder on the old tires that were off the car and said only do that 2 or 3 times max. Finally got them on in August, look good now,.. we will see what they look like next spring when the car comes out of storage. They also recommended SOS pads to clean.
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1975 Trans Am 455. 1 of 857
4 speed, Muncie M22 added at some point
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