Advice to fix deck

I’ve been searching for an answer to this to no avail.I’ve got a deck (pictures below) which hasn’t been maintained for at least 10 years. As a consequence, the boards are beginning to warp and turn grey.I think the best course of action is to sand the boards with either a belt sander or a sanding machine, and then reseal. However, I’m not sure if the boards themselves need their screws removed (difficult) to avoiding chewing up the sandpaper.Can anyone recommend a fix?Picture: via /r/DIY

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