Originally Posted by Texasscout

Think about this for a moment, you are picking up and moving "dust" which is made up of "dirt" that is out on the road. What is the "dirt" made up of? Fine crushed "rock". What is the "rock" made up of? One ingredient is quartz. What is glass made from? Right on. What is the Mohs hardness of quartz? About 7. What is the hardness of glass? Right again, 5-6. What is the hardness of "clear coat"? It damn sure ain't more than 5!

So you pick up this "dust" and it sticks to the "duster" and you drag is across your nice clear coat. I don't care how "light" you dust, you are going to scratch it.

See this link and you will see the hardness scale:

Mohs Hardness Scale