Red Clover tends to repel water or herbicides, since its pores are very small. This can easily be over come by adding 2 teaspoons of dish washing liquid per gallon of mix to any 2.4.D. type of a weed spray. This will break the surface tension of the water which will enable it to stick to the leaf surface. If you wish you could go out and buy a commercial product called a "spreader sticker", but it is pretty much the same thing as dish soap, just a lot more expensive.

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Mike Maier
aka
The Plant Doc

But.... Clover is a member of the legume family so shares that family’s ability to make use of the nitrogen in the atmosphere. Hence it will always grow better than the lawn grasses. In fact, some gardeners decide to take advantage of its hardiness and grow a completely clover lawn.I for one, am satisfied with what Mother nature decides to "grow"; However, if you wish to control clover in the lawn,Your safest bet is to either Cut the clover extra low (weed-eater) or put boiling water on the'intruder' to slow it's growth, then FEED YOUR LAWN The well fed grass will out grow the clover, clover usually appears in lawns low in Nitrogen.
It's the cheapest and most EARTH FRIENDLY way to go

I would not want to pour boiling water over any lawn area that I was trying to restore. The hot water will kill the lawn. Just setting a hot cup of coffee on the lawn can do a lot of damage. Just look at my lawn where I sit in the morning

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Mike Maier
aka
The Plant Doc