Originally Posted by
DrTimPerkins
It isn't terrible and you could probably just leave it without any real problem in my opinion. The heating surface is clean and shiny, which is the most important part. If you're still getting sap and want to try to clear it a bit more you might try the sour sap method (fill with sap, let it sit for 3-4 months..beware the smell) -- this is essentially the same as the vinegar method, but longer. Or try a mild pan acid (phosphoric or citric) soak...just don't let it sit more than a few days and rinse it extremely well since it's a soldered pan.