Old deck boards- what to do to smooth them?

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deck needs help. some screws stick up a little. can't get them down flush. some rough areas that can cause splinters. this deck is almost 20 yrs old. can it be helped. don't know if you have to sand it, never heard of this, but!.will stain cover the rough spots, seen a deck cover from lowes and i did not see very many positives about it. thank you
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