From the Bar Keeper's Friend Collection. The Bar Keepers Friend Coffee Maker Cleaner removes oily residue that can make coffee taste bitter. It's safe to use on automatic drip and single-serve coffee machines (for best results, use Bar Keepers Friend Coffee Maker Cleaner after descaling). NOTE: Actual product packaging and materials may contain more and different information than what is shown on our website. We recommend that you do not rely solely on the information presented and that you always read labels, warnings, and directions before using or consuming a product.