<P> In the 1950s, the product became the base of a line of cleaning products made by Indianapolis - based SerVaas Laboratories, which started producing and carrying products under the Bar Keepers Friend brand name . Additional products manufactured and marketed under the Bar Keepers Friend brand name include liquid, cream and spray cleaners . SerVaas Laboratories had 40 employees in May 2011, and 54 in April 2016 . </P> <P> Bar Keepers Friend products are mass - produced in a manufacturing environment that has significant automation in the process . The powdered and canned (original) product is formulated in separate two - ton batches during the production process . In September 2016, the canned powdered product was manufactured at a rate of approximately 60,000 cans per day, which are packaged in 12, 15 and 21 ounce cans . </P> <P> According to the 2015 material safety data sheet, the ingredients are feldspar, linear sodium dodecyl benzene sulfonate (DDBSA), and oxalic acid . Unlike more abrasive cleaning powders such as Comet and Ajax, Bar Keepers Friend uses oxalic acid as its primary active ingredient . A similar abrasive cleaning product, Zud Heavy Duty Cleanser, also contains oxalic acid . Prolonged use and extended skin contact may cause irritation, peeling and contact dermatitis, which is avoided by wearing gloves . The product can also be an eye irritant . </P> <P> In 1994, Consumer Reports found Bar Keepers Friend to perform on a par with Mr. Clean for removing baked - on soil, tea stains, and other pot stains, and that it was better at removing rust . While recommending Bar Keepers Friend for a variety of household cleaning uses, author Heather Solos warned that it should not be used to clean silverware, pewter, or real marble . </P>

How much oxalic acid in bar keepers friend
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