Generally speaking belts are inexpensive, if you have reason to believe that yours needs to be replaced, get one and then tell us if you really needed it! I just buy a new TT when the belt gets worn! : )
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Never, I own a direct-drive table. For those less fortunate, a cleaning can help (clean both the belt and the surface of the platter or sub-platter that the belt rides on) and VPI recommends putting the belt in a baggie with talcum powder in it before replacing it on the turntable. I have never heard of another manufacturer suggesting this regimen
Rubber renew. Google for the best deal/local sales. $5-6 for a small bottle which will last forever if you're just cleaning turntable belts.. your belt will be just like new again... maybe even a bit better. Talcum powder sounds like a bad idea, odd VPI would suggest making the rubber surface less likely to grip the platter at 100%.
I believe that the logic behind the VPI direction is for the the belt comes cleanly off when leaving the platter on the way to the motor spindle. In other words, it does not grab the sub platter on the way off. Another idea, posed some time ago was, if using a flat belt, to put a twist into it for exactly the same reason. This is a free tweek and very easy to try, well except for those of us with direct-drive tables.