Reading these posts, quick question. I have the radiator out of my 91 124 at the moment. I noticed that there does seem to be soem accumulation of "crud" at the bottom of my evaporator coils. Noticed in this post that someone stated that they cleaned these out. What is the best way to get this done? Will start on cleaning mine soon and thought air first @ 100 PSI and then hard water stream from inside. Will this "gat er done"?