I have removed 1 door from my kitchen cabinets. I put stripper on the back of the panel and it only removed a slim layer of material. I did this 3 times before I gave up. I didn't see any improvement in removing the product I think is stain. I then tried to bleach out the stain with simple bleach but this only made the cabinet look whitish. I have tried sanding the door face but that leads me to believe that I must remove a lot of material before I get to a product that might be acceptable to start with. Do you have any suggestions before I go any further?