Recently I was visiting George Merrill, the renowned turntable guru, at his studio outside of Memphis, TN. He sells this product and demonstrated it for me on his top-of-the-line Merrill-Scillia table. He swears it works. I just couldn't imagine putting, yet, another tweak on my table, let alone another arm and brush. I passed on the opportunity to buy it; I believe George sells them for about $20.
George Merrill's Analog Emporium:
http://www.gmanalog.com