I know some people stir and siphon/vacuum while waste floats so you don't suck up sand, however you will rarely ever be able to maintain a 100% sparkling new tank. The best you can do is just keep this stuff from piling up.
I had the same problem until my mom found a cool video on youtube. I have the cypher hose that you hook to the faucet to clean. Anyways the big funnel that you normally use to clean, take it off. Put a bowl under the spout where the water comes out and any sand will go into the bowl. Also my baby trumpets were sucked up and went into the bowl. Back to what I was saying, take just the hose and gradually and slowly get as close to the sand as possible to suck up the nasty stuff. Works like a charm. I love sand for several reason but hated cleaning it until now.