Martin, Caustic soda is the ingredient in oven cleaner, greased lightning, etc... that is the chemical which breaks down the anodize finish on the aluminum trim. Do you have household Lye (crystal drain opener) in the Netherlands? Lye is caustic soda, and I guarantee it will cut your anodize-strip time down to a minimum. This is what I used and it works fast. It was about $4.00 for a 16oz jar, and I think I used about 4 heaping tablespoons/gallon of water, and in one batch I stripped the anodizing off of my windshield trim, rear window trim, and headlight bezels. It's MUCH cheaper and much more effective than greased lightning, and there's enough product in there for you to strip more trim than you'll ever want to. CAUTION: When working with caustic soda, always use heavy duty Nitrile gloves and wear eye protection (goggles). If you get any on your skin, rinse it off immediately. Caustic soda will burn you.