I saw this mentioned on another thread, but can't find it so..................
For $3.99 for a 32 oz. spray bottle of Westley's Bleche Wite
tire cleaner at Auto ZOne, I got my scuffed-up, dull tire lettering looking like new
in about 1/2 hour. Just spray it liberally directly on the lettering (careful! keep it off your aluminum wheel rims!), let it "cook" for a few minutes, spray on some water from another spray bottle to rinse, and wipe it off. Job done! Have plenty of clean rags or shop towels handy -- they'll get real dirty. I used a rag to "dam" the spray runoff from dribbling down on my rims. I didn't use rubber gloves as recommended on the bottle, but could feel the stuff causing a slight burning on some fingers. Wash your hands liberally after using, and don't rub your eyes before you do
This will give you as much satisfaction as cleaning your windshield.