[Equipment] F & P Eson 2 mask elbow sticking after a few weeks

[djorr19]

Hi All,   I've been using an f&p sleepstyle for a few years and generally speaking I'm very pleased with it. However as the thread title says the rounded end of the elbow tends to get quite sticky after some weeks with each new mask and i'm guessing that it's probably mineral buildup. Where I am right now I haven't found any distilled water so far which I think does help. Have any of you found what can remove this buildup, is it best to soak it in pure vinegar or is there something better?

thanks,
David