Hi,
As csuk says, try & get a scrubber drier, if not try & get a wet vac. Dry vac first, then mop the floor (pretty wet) & use wet vac, dont let it sit long incase seal isnt too great on floor. Just do this a few times to clear dust. For shelving, its best with dry duster first then damp wipe & buff off with micro fibre cloth. If there are plastic pricing strips on the front edges make sure these dont get wet & try to dry wipe off in one sweep or you will get static build up & it will attract the dust. Obviously do the shelving first lol,
Hope this helps,
Ron