most polishes only dust when their lubricating properties are used up ie worked to long into the paint or temperatures getting too hot and drying it up

sponges are ok but please remember that they are made of closed cell foam which will keep any particle held close to the paintwork and can cause scratches (if you drop your applicator on the floor put it to one side and use another one even if it looks clean it will not be)
if you an get some meguires applicators from halfrauds at a pinch or some proper sonus microfibre applicators from ebay or else do a search for them as they ar inexpensive and wil do the job

thanks dave