But a slightly more complex resin of the same type proved able to draw even sodium atoms out of solution, replace them with hydrogen. This merely substituted acid for salt, but still another resin ...

Just scrape off the bulk of the resin and then drop it into a Ziploc baggie with 90-100% isopropyl alcohol for a good three-hour soak. You can also use a bit of non-iodized salt as an agitator for ...