Usually if there is noise, it's caused by DC on the inputs(from the source).
You can disconnect the source and short the inputs to see if the noise is actually the potentimeter. If so, you can try a lubricating contact cleaner...if that doesn't do it, the pot will need to be replaced.
The VPC-1 came with a wrench to disassemble it (5/64 Allen...not Torx).