Since we never use synthetic oils on our products, this problem can be solved quickly. The green pamphlet that came with your product clearly states that before using your product, you should wash it thoroughly to remove any sawdust from production. If you notice staining after a thorough cleaning, this may be occur when teak products are constantly exposed to moisture, water or are in areas with limited air circulation. An easy solution for this is to install gliders/stoppers under your teak product. This will raise the wood and help prevent soap residues, beauty products used and the natural oils of the teak wood from staining light-coloured grout and porous tiles and surfaces which are prone to staining. But most importantly, this will allow more air circulation and help dry the bottom of your teak product that is constantly exposed to water, moisture and in areas with limited air circulation. Gliders are included with our shower benches. If these were discarded, gliders are readily available in hardware stores.