I get a cheap roll of masking tape and fold it back on itself on the roll. That way I can stick my hand in the middle and roll the tape over whatever needs to be cleaned. I also "roll" it on the design wall (or across furniture to get rid of dog hair). When I fold it back on itself I leave the end slightly off center so there is a little 'tab' on the edge where I can lift it off itself to start a fresh piece.