Use a good microfiber towel (I love The Rag Company towels, 70/30 blend absorbs water better) but if the car is dirty, wash it first. There is always a risk using silicone blades that there is a small grain of something and when wiping that small thing will cause scratching. If there is absolutely nothing on the paint (can there ever be such a case?), one could use the blade. It is all about what kind of risk you are willing to take and what condition of your paint is sufficient for you. A tip for using the microfiber: Make it wet and squeeze the water from it and give it a shake before starting drying, that will make the towel absorbing the water much better. Another tip is the use Opti-Seal as a drying aid.