Vinegar contains numerous flavonoids, phenolic acids, and aldehydes. Twenty percent acetic acid vinegar can be used as an herbicide. White vinegar is often used as a household cleaning agent. Vinegar is known as an effective cleaner of stainless steel and glass. Vinegar can be used for polishing copper, brass, bronze or silver. It is an excellent solvent for cleaning epoxy resin as well as the gum on sticker-type price tags. It has been reported as an effective drain cleaner.