Nicotine reidue on drivers

Wow smoking is very bad for your health.

No kidding, I personally have chosen not to smoke. However the previous owner of these speakers chase to smoke heavily.

mizike OP
Is there a safe and effective way to get old nicotine residue
 off speaker drivers? Yamaha NS 1000m
  Thanks, all. I was hoping to hear from someone who had actually tried this.

No leave them be don't listen to anyone saying to clean them, I have and was shocked, the mid and tweeter on theNS 1000, 1000x and 2000, are clear polypropylene cones, that just have a very thin vapor deposited coating of Beryllium on the polypropylene, any cleaning or rubbing will take it off and expose the clear polypropylene cone underneath.
Only one or two Yamaha's had pure spun Beryllium cones, and were as fagile as egg shells, the mighty GF-1
https://www.hifido.co.jp/sold/14-84924-31512-50.html?LNG=E
 and I think the NS10000 also.
  https://www.hifido.co.jp/sold/16-06185-99993-50.html?LNG=E

Cheers George

An individual on Audiokarma had a pair that were very nasty looking and cleaned them up with dish soap, water and a soft cloth.

https://audiokarma.org/forums/index.php?threads/yamaha-ns-1000m-drivers-cleaning-and-rufurbishment.6...

I was under the impression the Beryllium was vapor deposited onto a copper plated aluminum mold. I believe the vapor deposited Beryllium was only 0.03 mm thick (about twice the thickness of Al foil).  If it was free standing, it would certainly be very fragile because Beryllium is very brittle.

Whether they are free standing or on a polymer base, I would be very careful with them.