Metho on a paper towel. No worries.Thanks @H Brad Boonshaft. Some good tips there. It sounds like your approach will also slowly move the warped razor into more of a smiling shape.
I’ll try the coloured Sharpie next time instead of black. One trick I’ve discovered is that the overrun Sharpie comes right off with a bit of nail polish remover (acetone) when you clean up at the end. Sharpie ink is stubborn stuff.