How to get sand out of iPhone 4s speck case?

Hi, I recently went to the beach and dropped my phone in the sand and my case is just full of it(my iPhone is fine I just had to do a little vacuuming) I try to wash the sand out with water but it just stays there and I'm afraid to vacuum it because I fear the heat will cause the rubber/plastic to melt.

Try getting a china bristle brush (fairly decent quality paint brush available in home improvement stores) A 2" brush shouldn't be more than a few dollars. Also, get a can of compressed air. The brush may be fine on its own, to brush the sand away. The air will jostle loose any of those sand grains that just want to dig in to your case. You kind of brush and spray to knock those rotten sand particles loose.