Just noticed this on the lower headtube lug on my new Trek 715.
To ask the question more specifically...can I just leave this alone and ride the bike? I'm not looking to have a perfect vintage specimen but of course want the bike to be safe. There is no way I'm going to strip it and give a 24 hour oxalic acid bath and baking soda treatment. Just not going to happen.
I don't ride the bike in the rain, always store it indoors and live in a pretty dry climate. So if I just leave this alone and do nothing, what's the likely prognosis?