@mijostyn I am certainly not good enough with a rotary polisher to use that on my speakers, if you don't know what you are doing with one of those you can burn clean through the paint.
I don't need anything like the CQ Quartz because my speakers are not in the weather that beats up on a wax, the summer sun in the Memphis area is really hard on automobile paint.
@emergingsoul I am not sure what kind of paint is on my Sopra speakers but it sure looks like automotive paint. I use the products to help protect the finish and make them easier to wipe down when dust settles on them, (and finger prints that always seem to make their way onto my speakers). If you don't want to use anything like that that then I would suggest a soft damp cloth followed by a dry cloth. You just have to be careful what kind of cloth you use because they can scratch the painted surface, Griot's has some really good cleaning cloths and other products to remove dust and other contaminates without scratching the surface.