oh it's me again. My trusty Airush Starboard 6.0 is getting well worn. In fact if you shake it, it jingles like a baby rattle - all that sand.
First you need to find an good airplane hangar, then make sure there are no cats or hedgehogs, remove the bladders, don't forget to pop out the tube part and don't forget to tie string to the ends of the bladders and to the tube part for the center bladder (it's easier to get it back in place that way)
inflate the bladder and shake the ends to get the sand to the middle under the valve opening, then carefully vacuum out all the sand - hey presto job done - now time for anther tinnie, hehe