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Here's an article referring to white wall tires that should work for your letters
You Will Need:
■Cleaning product: ■Westley’s Bleach White
■Stiff brush or Scrubbing pad (ex: Scotch Brite)
Steps to Clean the White Walls:
1.Begin by selecting your cleaning product. These are readily available in most automotive departments as well as automotive supply stores. Household products are often effective as well, just ensure they are safe for the tires and will not result in early wear.
2.Spray the cleaner directly onto the white wall or apply it to the scrubbing pad first.
3.Now, it just takes some elbow grease and time. Scrub the debris from the tire.
4.Rinse frequently with water to check your progress.
5.Reapply the cleaner as needed and rinse the scrubbing pad frequently as well.
6.Once the white wall is clean, rinse thoroughly with water and dry.
Additional Tips and Advice
■Though cleaners such as Comet work well, they can dry out the tire which can lead to early wear. Choose household cleaners carefully and ensure they are safe for the tires.
■For the easiest cleaning, keep on top of the white walls, cleaning them every week or two. These frequent cleanings will allow for shorter, easier cleaning times.