Swiffer Dusters Disposable Cleaning Dusters Unscented Starter Kit, 1 Kit (Pack of 2)

Has the number of dusters in each box changed? One description says 3 per box, another says 5 per box.

Will this work on thick dust that's built up on fan blades? Or do you have to tackle it with something else first, then use these for maintenance?

Desciption is confusing- how many handles and dusters are there in this set?

I see on the photo that it is one pack not 2 as the title mentions. How many packages come included if I purchase this swiffer dusters?