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Whatever you use, you need to test it first. I've never stripped Porsche window frames but I have stripped other parts. There are a number of different aluminum alloys, each of which use different other metals as alloying elements. I can tell you that not all alloys react in the same way, so test it in a small area first.
In the US, people often use Easy-Off oven cleaner, the one in the yellow-topped can.
There are internet forums devoted to metal finishing; you may want to research this question there instead, as they have forum members that do this sort of work for a living.
JR
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