Iso takes much longer to evaporate fully than it looks

If you let iso evaporate it isn’t doing anything. The purpose of iso or dish soap is to dissolve oils. If you let the iso evaporate the oils will be left behind and settle back on the build plate.

I use two paper towels. One to wipe with iso, and the other to wipe the iso away.

If you want a fast dry (iso is 10% water) set the bed temp to 100C for a few seconds.