WD-40 may clean better because of its lubricating action and the mild acid in the formulation. Alcohol leaves no residue. I don't think it matters a whole lot what lubricant you use. Rather than just rotating the fuse, which may help temporarily, try removing the fuse and clean all contacts with Scotchbrite or 400 to 600 grit paper. I'm anal-retentive when it comes to electrical contacts.

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95 E320 Cabriolet, 159K