Clean the surface first to get the dirt and crud off, then wipe it with white shoe polish, wipe off the excess, and you should be able to read the numbers with a small inspection mirror.
Clean the surface first to get the dirt and crud off, then wipe it with white shoe polish, wipe off the excess, and you should be able to read the numbers with a small inspection mirror.
I agree this method works well.
I have used it myself
on the drivers side sill.