Betty Marino

I have foul odor from bathroom,no leaks found ,cleaned & disenfected floor to ceiling ,drains all clear …can there be a foul odor comming from inside the wall,if there are any open spaces ,like around pipes & also this toilet drains into the wall,but toilet is bolted to floor..please help..landlord says he smells nothing & refuses to open wall or anything .syas thers no problem..believe me it is nasty…Betty