Here is a long list of tips and uses for used coffee grounds which I have researched on and collected from all over the web. Don’t let used coffee grounds go to waste. Use them around the house, in your garden or in homemade body-care products. Unclog drains: Pour used coffee grounds down the sink or bathtub drain, followed by 3 drops of dish soap and a pot of boiling water. This will clean and clear the drain of clogs and built up grease. Keep Cats out of your garden: Tired of your neighbors cats traipsing through your flowers? Just sprinkle some…