According to Redittor firelark_, pine resin was historically used to “draw out impurities or poisons, stem blood flow, and is both antibacterial and antifungal.” It was also explained that elder bark reduces inflammation, beeswax is an anti-inflammatory, antibacterial, and antiviral, and olive oil restores damaged skin cells. The user concluded the comment with, “This is nothing more than a topical salve that would clear out pus, prevent infection, keep the patient from bleeding out, and aid the skin in healing. So, the actual 'cure' for greyscale is to cut it off, lol.” Another commenter summed up our reaction to this fairly simply cure quite well by saying, "It took them a thousand years to figure this out?" That seems shocking, but remember, we aren't yet sure this "cure" is actually going to work. Don't forget Archmaester Pylos died of greyscale, and that cure is from his book.