Deflask them and use 2 bowls of tepid water(barely warm) in one bowl put a few drops of a fungicide, using a pair of plastic tweezers rinse the seedlings in the warm water washing of the media, lay on a paper towel and allow to dry, then dip them into the fungicide water and repeat the paper towel treatment, pot up when done. It takes about 1.1/2 hours to do a normal 30 plant flask. Works well for me.