I have an undertrack automatic pool cover. Along the sides near the track (on both sides) and more pronounced near the cover box, there is a black residue. Is that normal? I am considering having a pool company come out and take a look but wanted to check here first.
FYI: This cover was installed late last summer. When I opened the pool up a month or so ago, I deep cleaned the cover, pressure washed the tracking, and sprayed down the pulleys.