If you are not using this, you're working to hard. @turtle tipped me off on this a while ago and it's FANTASTIC at getting those stubborn coffee oils out of my stainless steel travel mug. You know what I'm talking about - after a few weeks of use the inside of your mug looks bronze from the coffee stains. I pour a little of the powder in to the mug, hit it with a dab of hot water, then use a toothbrush to scrub, followed by a washcloth. Then a wash with dish soap. Turns out better than brand new!! Way better than simply using dish soap since this actually breaks down and dissolves the coffee oils.