Formula 420 cleaner quickly became a much sought after cleaning product, thanks to its unique biodegradable cleansing action. Forget about the hassles of soaking and scrubbing for a long time. Simply pour Formula 420 on your Pyrex, glass, metal, or ceramic object and wait for one minute as the Formula 420 goes to work cleaning and deodorizing! Note: Do not use Formula 420 on Acrylics or Plastics.