sticky) an old toothbrush might work better here.
use the paper towels to mop up the vinegar and additional dirt and insect graves. you can press the back of your finger against the towel as you "mop" up the vinegar. if your tracks are too narrow for a finger, try using one of those nasty q-tips.
schedule another round in 3-6 months! all done? schedule this to-do for 3-6 months from now (depending on how fastidious you are). 