The quickest, most effective (and probably most expensive) way I’ve found is using electrical contact cleaner. (Essentially isopropyl alcohol in a can).
I just hold the paddle over a bin and give it a full angled blast in one slow, smooth stroke moving down the paddle. Keep the nozzle real close (about an inch away) for maximum pressure but with enough width to only need one pass. Each paddle literally takes seconds to clean, all the crud ends up straight in the bin and the stone is dry by the time you’ve done the next one.
If you’re really keen, follow up with a quick, light pass of electrical contact lube or Inox, CRC etc to stop any rust, displace moisture and reduce swarf load up on the next sharpening.
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