I usually scan with a black background from a removable crafting paper.
For dust removal I use a dust cloth called Mighty Duster I bought at Wal-Mart that does not require any water or spray to work. A quick swipe of the scanner glass and the Vario plastic page (if used) or even stamp itself (gently) does the job.
Not as good as the anti-static brush and others, but useable and workable.
