Answer by
Dean (4035)
It sounds like you have mildew. It's common, especially in humid climates and in bathrooms that are not well ventilated. Use a product like TileX (mildew remover). Hose down the entire area with the product. Make sure the room is ventilated. Avoid breathing the mist and dont' get it on your skin. Follow directions. Scrub with a stiff brush.