I have a small lawn that we service. Actually a family members. When we started it last yr their lco didnt treat it all season. I dug a hole and found grubs those army worms and there was weeds all over. I treated it with grub control three times and then it was winter. Now spring comes no grubs but weed galoor. I sprayed it with lesco bentgrass herbicide and it killed some. Then i slit seeded and aerated. i spread lime seed and seed starter and it began to grow. It is now all weeds again mostly violets. It has been treated with dimension, lesco spray, orthoweed b gon, and scotts broadleaf control fert. I dont know what to do. They want a nice lawn and i cant do it. Any tips or suggestions?