Often known by its street name, is a concentrated isobutyl nitrite solvent cleaner from the world famous English brand. This product is used in a variety of situations that would require its cleaning powers, such as; cleaning leather stains, removing scuffs and residue from car bumpers, removing bug residue from car windshield, etc,. Use gloves, dip a cotton swab into solvent and apply to area to be cleaned. Just as with any chemical, first use it on a small area to ensure compatibility.