The cabinet floor beneath my kitchen sink has had old water damage from previous owner for a number of years. I finally had an opportunity to go in and try to replace the area. After I got the floor completely up, I ran into what I am pretty sure is mold as the subfloor and some of the wall near it appeared black or black spotted. So I went to Lowes and picked up the Concrobium Mold spray. I sprayed the area (about 2'x3') pretty good and let it sit for a while until it started to dry some. Then I hit it again and this time - grabbed some Shop Towels to try to wipe some of the black stains on and near the subfloor. I pulled up a lot of the black stuff and reapplied once or twice again after. The subfloor looks cleaner but still looks pretty dark and black in areas. How do I know if I have done enough to truly get rid of the mold and stop it from spreading? Should the stains not be visible anymore? Is it worthwhile to apply Zinsser BIN mold killing primer as a final measure? Should I leave the cabinet doors open? It seems I often find myself in these situations where I go to fix one thing and something else is uncovered that makes things take waaaay longer. Current state of floor as best of an image I could get of it PHOTOBUCKET FAIL! Thanks.