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

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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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