No I don't but it's a great idea for sensitive skin. I found some MCN would spark rashes more than others and just avoided those.

As for zinc products and silk I would try on some scrap and see. Just slather it on the scrap then pop it in with your normal MCN wash and see what happens. I imagine some eucalyptus oil might help shift any build up (I have a wool wash with eucalyptus oil I use for silks and its great).