As mentioned dont use a sponge there a bastard for holding microscopic particles of gr it. I use a good chamois keep it clean and it should be no problems microfibre wash mit. To wash the car down starting at the top working your way down. Then a microfibre towel and chamois to gey excess water off the car. Polish and wax is all down to personal prefrence.
If you need any advice feel free to pm me inwas a valter/ detailer for 7 years
If you need any advice feel free to pm me inwas a valter/ detailer for 7 years