90 year old basement, concrete walls and floor. Musty as all get out down there. Doesn't seem to be an issue of mold though I wouldn't be surprised if there was once a mold problem. The floor seems to be the primary culprit here. Old, unsealed concrete slab. I'm thinking it needs a good deep clean and to be sealed. Wondering how you folks might go about something like this. I've been looking at Fiberlocks Advanced Peroxide Cleaner. Thinking of painting a couple coats of Killz on the floor but I'm not sure how it would hold up as a floor coating on its own. Is there a better product? Maybe a penetrating sealer for this kind of thing?