I was digging around through my attic and noticed it wasn't properly ventilated, and on top of that I only had R19 fiberglass bat. I had 5 quotes to re-insulate with cellulose and fix the venting. Out of the 5, 4 said there was "moisture and discoloration" and the last guy said "No, you have some mold". Based on testing I have done with a test kit from Home Depot, all of the spots the one guy said had mold, has mold. I tested multiple trusses through the attic and some have some growth while others don't. All the other guys wanted to sprits a little bleach mixture on the problem areas, fix the venting and insulation, and call it a day. This last guy wanted to sell me on an $800 mold removal using sanitizers then spraying down the wood in the attic with an antimicrobial mixture. He also is a certified mold removal professional, so there is a conflict of interest. I had to look pretty hard to find some mold spots on wood throughout the attic. Nothing is growing very visibly. But no way in hell "spritsing mold areas" would get all of it. My question is, Who should I believe? Would it be wise to have the attic sprayed down?