Best home remedy for paper cone woofers cleaning the dust off?

Any advice on nicotine residue on Yamaha NS 1000 BE drivers??
I have an old pair from when I was young and stupid and smoked like a fish in the house. I would like to restore the Speakers. No problem on the cabinets. But what to do about those BE mids and tweets??

My paper cones usually have accordion surrounds so I use a soft paintbrush which has never been used for anything else, and it does a pretty good job of reaching into the valleys of the accordion. 

Air vacuum, brush head on any vacuum.  Best to not use any liquid. 

Are people not concerned about there being potentially residue from a Swiffer? They appear to be treated.

No Swiffer worries, mate...