in school we did an experiment with a nail soaking in a glass of coca cola ..the thing was rusty adn dissolving as i recall..so pour Coke down there to ream things out...Drano is Alkaline, (Basic), not acid...LYE...
vinegar is acidic--do not miux the two unless you want a result like in my grade school where the boys put cherry bomb fire crackers downt eh toilet and blew one up.