Trade Secret Scratch Removers work with the finish of furniture. If the water stain is on the surface, the scratch remover will wipe the eye sore away. However, in those cases where the stain has permeated into the finish, an additional step is required. Using toothpaste, lightly rub the affected area then remove any excess paste. At this point, apply the Trade Secret Scratch Remover and the defect should mostly or completely disappear. It is always a good idea to try this on an inconspicuous area first to ensure that the repair leaves the desired results. In some cases, you may have to call a professional. Call us first so that we can point you in the right direction.