i use meguiaiar's gold class shampoo, ive not bothered waxing mine yet as i want the paintwork sorting first, but the gold class shampoo brings my silver 156 up to an excellent shine. i used meg's clay and QD, and the clay was filthy with mine, but if yours is fairly new, i would just be gentle with the clay. for removing water i use a silicone blade thingy
and then a microfibre towel to "buff in" any remaining water/water swirls.
just my 2p!