Is it common practice to wash with a soft microfiber cloth to remove the yellowish skin 4 times a day after ablative CO2?

Each physician will have their own preference for care after a CO2 laser treatment.  These treatments can go to different depths of the skin, and the type of instructions for after care can be determined by the depth of the laser.  I would recommend following the instructions given to you by the physician who treated you.  It can take a few months to see the effects from a CO2 laser and sometimes, treatments can be repeated to give further improvement.