I have a lawn that has 4-5 years of acorn buildup. They are embedded into the soil to the point when they are choking the grass and hurt bare feet when walking across the grass. What is the best way to remedy the problem without totally redoing the lawn? I want the acorns gone!!! Im not sure a thatcher would bring up the acorns. Suggestions?? By the way I did a search and all I found was ways to remove the acorns on top of the ground.