Look at it under a magnifying lens, if it doesn't seem porous then you should be fine to reuse it.
You could dry tumble it for a while to abrade off the outer surface, then rinse it if you want.
Otherwise if you consider that the sand has probably been outside for quite some time before you acquired it, there is little to worry about.
If it is porous, then sure, i could see it holding onto detrius to some degree. If that was the case then I'm not sure how I would clean it. This could be more risky as it may hold onto the chemicals you try and clean it with. Heat and/or acid might work here.
Hopefully you find that you are in the first camp and the sand is like small glass. Vinegar would be my preference to wash with though, if the sand is solid, I don't think its necessary to risk using bleach, a bit of vinegar residue is not going to hurt anything.
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