1. the cleaning pad can be used on both sides, the direction is determined by the beads.
2. if the windows are dirty, the cleaning pad needs to be cleaned more often, I have bought an extra set of these and wash them in the washing machine at the end. Men's toys or windows on the house that are too high to be cleaned by hand.

1. based on my experience, the pad can be used on both sides. The orientation of the pad only allows 2 variants so that the caterpillars are not "covered".
2) I wash the pad with water, wring it out until it is only damp and then fit it again - depending on how dirty it is. I have also bought 6 pads for when I really need to use the washing machine. The latter is rare: I have cleaned 42 windows without having to go to the washing machine.
3. cleaning agents: I have tried various different ones. Some, e.g. W5, dry too quickly, so in the end I went back to the more expensive, original ones.

1. no, there are only two possibilities.... But you notice that relatively quickly!!! 2. of course, unless the disc in question has just been cleaned x times, because it cleans well if you use the right cleaning agent.... and how is up to the user's "idea of cleanliness" I think.... !?