Years ago when I had some plots that were over grown with weeds I thought of trying to use a long rope dipped in herbicide to drag over the plot. Looking back on that situation I didnt know they made products like this.
If your plot is just clover, have you tried using Clethodim? A product like Arrow 2EC has always done very well at killing grasses for me. I would agree with Bob though, I could see it being a valuable tool to have if you are looking to target weeds that are significantly larger than you plot (especially mixed plots).