Lava is a heavy-duty hand cleaner in soap bar developed in 1893 by the William Waltke Company of St. Louis, Missouri. Procter & Gamble acquired the Lava and Oxydol brands in 1927. In 1995, P&G sold the Lava brand to the Block Drug Company, a pharmaceutical company based in Jersey City, New Jersey, that specialized in dental care products. Its two most popular products included Polident denture cleanser and Poli-Grip denture adhesive. By 1999, the WD-40 Company bought the Lava brand from Block Drug.
Unlike typical soap bars, Lava contained ground pumice, which gave the soap its name. The soap and pumice combination is intended to scour tar, engine grease, paint, dirt, grime, filth, and similar substances from the skin. The original beige-colored Lava bar soap, without moisturizers, is no longer manufactured.
Note: The word lava comes from Italian and is likely derived from the Latin word labes, which typically refers to a disaster, downfall, landslip, or slide.