first off hello to all I am new here. now to business I just bought a m470 vermeer with b800 hoe 95" trencher bar/ cable plow combo my project is to try and install geothermal lines. I am in Manitoba Canada and my soil is wet clay. how do i get my chain to clean? how do i get my trench clean need 6' deep for install and my trencher is leaving the trench about 4' deep?