This takes about 5 minutes and 50 cents to do and it improves the look or visibility of what you do it too. I did it to the Ford logo on my key and the lock/unlock lettering on my girlfriend's keypad, but it can be done to anything that has recessed lettering.
1) Take the white crayon and rub it over the recessed lettering. As I mentioned before, I did this to the Ford logo on my key.
2) Use the paper towel to wipe down the excess wax on the surface.
3) Repeat step 1 & 2 until you like the results.