There's this:

Vacuum your tank - without removing water

But generally, just invest in some good clean up crew and forget about it. Over time a nice healthy sand bed will be established. If you've got fish poo sat on the sand bed then you must have insufficient water flow anyway, but when waste does gather in dead spots, etc, it will be broken down and mineralised by critters, then be skimmed out or become nitrates/phosphates to be absorbed by chaeto / rowaphos.

It's an ecosystem you're trying to establish, so there shouldn't be any real meddling needed (other than cleaning the front glass) when everything is working properly, but that all takes time to establish.

I don't clean my sandbed Steve, the CUC do it :)

Sounds good Steve, I would recommend Halloween Hermits, Plain Red Hermits, Tiger Nassarius Snails, Mexican Turbo Snails and Brittle Starfish :)

I love my CUC already they are so interesting some of my nas snails are Olympic sprinters they way they zip around the tank. my Turbos cover every inch of the glass from the top of the water to the bottom my shrimps constantly try to clean my clownfish and have there own favorite spots and anyone who tries to move in gets a quick slap and my crabs well they just pop up everywhere ..

I am not counting my chickens as its too early but my tank is spotless .. the only thing I am a little concerned about is that there is not ENOUGH algae to keep them happy