The dryer sheet must be used
The dryer sheet must be used (as a dryer sheet) first. All the softener goes out of it and what is left is a loose woven papery sheet that is good for discharging static (and great for dusting floorboards). Rub was a poor word choice, really you don’t even need to make contact to discharge the static. Please don’t use a fresh dryer sheet on glass! Dana is right, that would cause issues.