It will fade, just clean the shank out really well with some alcohol, maybe give the plastic stem a good rinse(If it has a stock MM propionate stem, alcohol can soften it up). Power through it with a burley blend, or something heavy in Latakia if that suits your fancy.
One interesting thing that was suggested to me by an old timer is setting your cob in a sunny window.. I thought to myself, this sounds like BS, but I respect the experience of my elders so I gave it a shot and let it sit for 2-3 days. I'll be damned if it didn't clear a deer tongue ghost out of a cob.