I block the shank with an alcohol-soaked cleaner, then stuff the bowl with cotton balls and carefully fill with alcohol. You don't want to get any on the outside of the bowl as that could affect the stain.Thank you, I do have some Everclear on hand. What is your technique? Hahaha! don't consume the gallon!
Typically leave for 24 hours, then clean thoroughly with paper towels. If not 100% satisfied, then repeat the alcohol soak. The bowl coating used in newer Petes just wipes off easily with this method.