So I've cleaned my coop and dusted my Trio with Seven. Dusted the coop and threw some DE on for good measure. I've been reapplying the Seven and DE every couple weeks. Done so twice. I'm still seeing some of the bunches or egg clusters or whatever they are on bottom of his feathers. The Seven dust won't get rid of that, right? That just has to go away with time and him cleaning, etc? How am I suppose to know when I have this problem licked?