-Rick-
100cc
"CLEAN" tack cloth. Once the backing is removed, if you get any foreign material that finds its way to the adhesive side of the covering.... gently rub your clean tack cloth on the adhesive side of the covering and the transferred foreign material will be sucked up by the tack cloth. As long as the covering has not been warmed usually I find everything will come off on the tack cloth and you're good to go. I use the tack cloth on my project also. Gets any foreign material off the wood. I've also used a lightly alcohol dampened "terrycloth" to suck up any dust particles on my airframes before I lay down the covering.
Thanks stang, I'll give that a try if I have that problem again. Still waiting for my covering . Got the white but need the color.