Sorry for the delay in responding - the white crystals are due to the 3-piece jacket, and a big reason we switched over to the sleeping bag style jacket. If the 3 pieces are not fully, perfectly, sealed together moisture can enter causing stray mold to grow along the outside of the fermenter. Try to use a spray cleaner like lysol to get it out. The jacket material is waterproof, but the seams are not so I would not recommend putting it in the washer.
Were you able to get it out?