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I first tried cardboard. It lasted about an hour, because the rain started right after installing the cardboard. Cardboard grille blocks are like rain dances that actually work.
Then I used part of a roll of two inch wide masking tape. That worked well enough to show proof of concept, but was ugly to look at.
Then I put on a piece of 3M window film. I used the exterior grade because it's twice as thick as the interior grade. The original window film has been on for almost two years now.
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