Step 2 · Initial Mechanical Removal
Take a plastic putty knife or a similar non-marring scraper. Start by gently chipping and prying at the edges of the hardened putty ring. Because it's old and brittle, large chunks may break off easily. Work your way around the entire circumference. The goal here is to remove the bulk of the material without applying excessive force that could damage the porcelain surface. Do not use a metal tool at this stage.