I tape the cartos up in a big bunch and i sit them in front of a fan for a night and the next morning they're as dry as could be..
most plastic house fans ,,have a "just right" spot on the grille, to insert the carto into..just tight enough to hold the carto without falling out....toking end toward fan...cap off...mine were bone dry after 2-3 hrs...works great,,and fast!.....