to warm it. do not bring it to a boil.
if the porcelain piece is small enough to handle, lay paper towels or clean rags on a flat and level work surface. if the porcelain piece is large, lay rags or paper towels around the sticker.
dip a clean rag or sponge into the warm white vinegar. dab at the sticker, and squeeze vinegar directly onto the sticker. lay the vinegar-soaked rag or sponge over the sticker, and allow the vinegar to remain on the sticker 20 to 30 minutes.
remove the rag or sponge, and peel off the sticker with a plastic scraper. if any adhesive residue remains, repeat the process to 