If you live in a far northern or southern climate where it does not
get above 32 F or 0 C, you might just try getting some liquid water
and applying it uniformly to the windshield. Let it freeze, and that
should do it. If you need to you can chip it off and repeat if it is
not uniform enough. Or you can try to just coat the pits only. As an
alternative, you can get a large economy size box of Jewlers Rouge
from a reputable discount store such as Wallmart. Then take the Rouge
and simply buff the rest of the windshield down to the level of the
pits. Some have tried emory paper or even belt sanders, but they have
found them not to work too well. Good Luck!