The best stain buster is... sun! Yes, you see well. The sun whitens and removes even hard-to-remove spots. What if the sun is missing and we have a burning, dirty problem? For natural materials, galas soap is checked – a fresh stain rub, leave for a while afterwards to wash. If the stains are very persistent, as a last resort you can try oxygen stain removers – soak for a few hours, rinse and rinse well.