Speaker Polish?

I would contact the manufacturer and see what they recommend. Finding out about something like this the hard way may be something you want to avoid.

Having said that, i typically use lemon oil to clean and polish most of the speaker cabinets that i have. This can ( and does ) darken the finish on older cabinets, bringing back the lustre and richness that they once had. You are smart in wanting to take care of this situation prior to them actually needing maintenance though. Sean]
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I always used Boiled Linseed oil on hand rubbed oil finished wood loudspeakers. If the wood has a poly or protective finish,you'll have to treat that differently.

For cleaning, Murphy's Oil Soap is good, and for polishing the above mentioned Lemon Oil or Orange oil work well. Be careful with the Linseed Oil, because if you get the wrong kind, it will be tacky. Also, go easy with the oil, because most speakers are veneered, and too much oil can soak in, and make the veneer lift off.

Also, the above comment about making sure what type of finish is on the speakers is very important. If you have a clear lacquer type finish, use wax.

You might go to a music shop and get some guitar polish amde by Martin or some other maker for acoustic guitars. Works for me and does not have any bad side effects.

I use Johnson Wax Lemon Favor available at a Target Store near you. Be careful not to rub any dust grit back into the finish. Oils are nice for solid woods. If my veneer lifted I'd lose my mind :^)