Do you use Armorall on the backs and poles or is it easier to get them detailed for you. The wax without cleaning will be a way of cementing in the dirt. Try a small amount of car soap in water scrub lightly with chamois then rinse off the soap but the rinse will make a scene. I always used to use a hose.Dry with your wifes favorite bath towels white or ivory colored are best. Apply the faintest smear of wax let it dry completely. Then use dry chamois to buff avoid the gyro buffers they leave swirls .I like McGuires but the German wax is better they say . I found it to be a PITA.
Microfiber cloth for dust, then use automotive wax once a year or so to protect the finish (am assuming the OP's speakers are just dusty, not dirty); must be careful not to grind in any abrasive dirt. Treat them just like an automotive finish (which they are).
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