Man we got lucky today. Our kids have a small walk in closet. It was pretty crammed with toys, blankets, stuffed animals.... kids stuff. My wife goes to look for a shirt and moved some shit in the back of the closet and saw that the whole bottom half of the back wall was covered in mold. Im thinking water has been seeping through the drywall from outside and turning to ice in the closet during the winter and since it's dark, cold and lots of stuff that can mold it just went crazy. I got right to work, got the kids out, masks on and my son and I threw out all that moldy shit. Got the mold on the wall neutralized very fast first with bleach then with white vinegar and lastly some mr clean all purpose then scrubbed it until the paint came off lol From now on im keeping a fan on that wall and the closet light on 24/7 and nothing in the back. Now maybe we can convince the landlord to replace our 1970s siding that is buckled and unpinned all around the house. That closet is external from the house and facing the south side which is the high wind and storm side. I wish we could just move but with how much rentals cost and landlords not letting tenants grow in rentals we are stuck. This could have been really bad if the wife didn't catch it. I'll post some before and after pictures in a bit. I know im going to have to cut out the affected area and replace it but no point until they fix the cause.