I have 2 customers that are chomping at the bit to have their lawns dethatched asap. They both have snow(very, very bad), the worst that I have ever seen. They want their lawns dethatched to get rid of the snow mold, but the experience that I have with dethatching tells me I should wait until late April. They do not want to wait that long in fear of loosing their lawns. Can anyone give me advice. Also which style of dethatching works best for snow mold. I have both the power rake and the knife cutting dethatchers. I live in Northern Indiana.