Stupid Question "Tire Paint Stick"

I was at Milan last night watching. How do these racers keep the white M/T letters on the rear slicks so clean. I tried to clean my letters and the paint came right off? Any thoughts or what the use to keep clean.

I know stupid question but I don't have the answer.

Bro there are no stupid questions (only rude replies!) however I do not know the answer to your Q but I'm sure drag racers & resto guys do & will chime in.

There is a paint stick that you can get to repaint the white letters on the side. Someone will show up someday and tell you where to get it, I don't remember. Maybe put the 'paint stick' in your title to get their attention.

I see one thingie down there a few rows in here;

https://search.yahoo.com/search;_ylc=X3oDMTFiN25laTRvBF9TAzIwMjM1MzgwNzUEaXRjAzEEc2VjA3NyY2hfcWEEc2xrA3NyY2h3ZWI-?p=tire+white+letter+paint+stick&fr=yfp-t&fp=1&toggle=1&cop=mss&ei=UTF-8

search link - click here

Summit Racing has tire paint markers.

Usually only new tires have good looking letters. They turn yellow pretty quick. I don't know anyone who renews their letters, only their tires.

Ive known a few people to shoe polish them. Cant speak for how well it works.

^^^ that is a good idea & what I would try if I was in that situation & preclean it with something that works well on rubber.