Used speakers: Cleaning tips?

Try a soft paint brush

Soft brush would be fine for the cones and try some of the better furniture cleaners and polish out there. Really not a hard task and very enjoyable.

I have been using Pledge Dust and Allergen brand dry cloths. They come in a plastic bag like pak of 16 and claim to "grab and remove dust and allergens, a dry eloctrostatic cloth" They have been easier and more effective than using a more conventional cloth and spray product. They leave no chemical residue -just work magnetic like, on dust. I shake them off after use and they last for a few days without problems. I have even used them on a record rather than a brush. I can't remember the price but I will not be without these from now on, very handy.

Why thank you!
Will get some Formby's, Pledge cloths and a soft brush for cones is a great idea!

The Murphy's Oil Soap is a wonderful cleaner. I bought some used speakers a bit ago and tried cleaning them first with Kleen Gaurd. The Kleen Gaurd was making matters worse. My wife got out the Murphy's Oil Soap; what a difference.