Silly question but how does one clean off dust off the speaker cone???

I'm working on my latest acquisition, 3.1 TL's. Took the speakers out to doe the Locktite application and found they all have a fair amount of dirty dust on the lower half of the cone surface.

I tried to use a vacuum with a bristle brush it's not doing a very vood job of getting it out. I'm hesitant using any spray on cleaner like Windex. Any suggestions would be greatly appreciated.

When i get this restoration and mad mod job is done I'd like to be able to show these puppies of in all of their glory!

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