Wipe away any loose debris from the track using a cloth. For narrow areas try a cloth pushed in with a toothbrush.
If your track area is sealed and will hold liquid: Heat DYC White Vinegar until hot and pour into the track. Allow to sit for a few hours. Then flush with water and remove any left over scum with a toothbrush and cloth. Rinse with water and dry.
For other style tracks, soak paper towels in DYC white vinegar and push into the tracks. For hard stains and marks leave for a few hours. Otherwise leave for a few minutes and wipe with the paper towel and brush with an old toothbrush. For extra abrasion sprinkle with baking soda and scrub. Rinse with water and dry.