slugs catching upon raising main
Clean the track carefully of dirt, grease and oil. Clean with a strong caustic cleaner. Do the same with the sail slides. Then simply rub on candle wax to the inside of the track and slides. Do yearly.
You can buy fancy cleaners and track lubes; but, nothng beats candle wax! Dont use oily based ''lubrication'' compounds or the track will accumulate more dirt. :-)