If you don't have heniously large runs/sags and drips you can wet sand that stuff out.
Get some 400, 1000, and 2000 grit "wet" sandpaper (the kind used by auto body guys).
using 00 to 0000 grade steel wool works about the same...
Small container of water and a work area you don't mind getting a little messy.
Wet sand the runs w/ 400 to remove as much of the runs and drip accumulation you can. Make sure to keep the area you're sanding wet and rinse the paper in the water constantly. Once you're relatively satisfied with your first pass, move to the higher grit paper and repeat.
Once it's smooth enough for you, you can polish with rubbing compound, et al to get the gloss back up.