i have a 20something ton trane unit that had a bad compressor, cause was a hole in the condenser coil from vibrating against the side of the unit. that led to the oil all pi$$ing out and running dry. so, problem solved, replace condenser, patch coil, all set! right? WRONG! since this hole is on the bottom loop of the condenser ALL the remaining oil in the condenser is now sitting at that hole. so, brazing over it is dam near impossible. HELP!! How do i get this hole clean enough to accept the silver solder?