I can attest to the aircon airbox screws being completely rusted. Already snapped head off one. And this is on a car that lived in Germany. Why didn't they use stainless or anodised screws the cheapskates?
You may want to try mixing up a solution of acetone and vegetable oil (from the supermarket). Around 50/50. It makes for a very good penetrating oil. Leave it soaked for a few hours then it may reduce the chance of those screws snapping.
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