What's Best Care for Piano Black Finish Speakers?

The cloth to which Mike refers is generically called "microfiber" - very soft, highly absorbant, no lint residue. It's also widely used for cleaning optics. I used microfibre for my glasses, my camera lenses, and my turntable (which has a gloss black gel coating and an air bearing arm which gets a wipe down periodically). Be aware that there are innumerable sources for microfiber cloth today, made from a variety of synthetic fibers for various applications, and some are better than others.
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A microfiber cloth and Wizards Mist N Shine works great for me. It's not a wax per se, but a cleaner that removes fingerprints, dust and stuff, does not scratch or make swirl marks, and is anti-static. Does a really nice job.

http://wizardsproducts.com/Merchant2/merchant.mv?Screen=PROD&Store_Code=WP&Product_Code=01214&Category_Code=

http://www.aawsales.com/index.asp?PageAction=VIEWPROD&ProdID=355

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Rushton,
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You are always as wealth of useful tips/knowledge.
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Thanks taking the time to share.
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Rgds,
Larry
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Thanks, Larry. I appreciate your comments.

Thank You... Gentlemen !!!

You've all given me wonderful tips and ideas and I appreciate them.

George