Urnex Clearly Coffee cleaning powder easily removes coffee oils and inhibits mineral deposits from forming in your Ratio stainless steel and glass carafes and filter baskets. To use, simply add one packet of cleaning powder on top of a paper filter and run half a cycle of water through your Ratio machine. Allow to soak for 5-10 minutes, then discard solution and rinse everything with clean water. You can also soak any miscellaneous items like the Ratio Kone by Able that have built up coffee residue.