Hi! We are doing a kitchen remodel. When we pulled out the old dishwasher, sink and cabinets we found mold on the drywall. The worst area was about 2' by 2' behind the dishwasher. There are also smaller sections along the 6' of drywall adjacent to that where the sink was, mostly along the bottom. The drywall is still solid - no buckling or squishiness anywhere. My contractor told us to clean it w a bleach solution, and if it still bothered me we can paint it with Kilz. My concern is that there is mold in the insulation. My contractor says the mold isn't that bad, and I shouldn't worry about. Should I trust my contractor, or should I insist on tearing out the drywall? It's a 1967 house. Thanks!