CentralNotice Bar Keepers Friend From Wikipedia, the free encyclopedia Jump to: navigation , search A can of Bar Keepers Friend. Bar Keepers Friend is a powdered cleaning product made by SerVaas Laboratories in Indianapolis , Indiana . [ 1 ] It's been produced since 1882, and was invented by a chemist in Indianapolis, where the product continues to be manufactured. [ 2 ] It has since become the base of a line of cleaning products by SerVaas, who started producing and carrying the product under the Bar Keepers Friend name in the 1950s. Unlike similar abrasive cleaning products, such as Comet and Ajax , Bar Keepers Friend uses oxalic acid as its active ingredient. 1 Active ingredient 2 Use and effectiveness 3 References 4 External links Active ingredient [ edit ] The primary active ingredient of Bar Keepers Friend is oxalic acid . Prolonged use and extend...