[Turk]

I lived with white side pipes for a year. Nothing to it.Yes they do get dirty like other pipes except white shows it better.

A little scotchbrite or a little sanding (it sands like chalk) and spray the area that needs touching up. VOILA!

It will look whiter than the rest of the pipe for a little while and first couple of times you run the car, it blends very easily and you can't tell where it was touched up.
Very easy!

TURK
ps. I have tried the others....so you wouldn't have to. Stick with VHT!!!