You know I think I mentioned using detergent or biodegradable soap to eliminate hard to kill weeds. I have found the absolute best way to eliminate clover is to use a liquid weed killer the type that you attatch to a garden hose. Just put a few 4-5 drops of dish detergent in shake well then atatch to hose and apply as usual. Just use at your own discretion. One application in early fall and early spring will do it.