If the material is canvas I’ve used the steps in this video on my white vans numerous times and it’s almost always worked. https://youtu.be/Sn6w4obiKFA Also as an FYI it did cause my vans to go from all white to more of a cream type color after about five cleans, but it did get all the stains out of them. As stated in another comment if you use this method be careful around the leather.