My OBRI (On Board Rust Inhibitor aka oil leak) is pretty bad. I want to clean underneath to try to start figuring out where my worst problems are. There are plenty of good threads on common leak areas. What I need to know is how can I clean the living $?@# out of the underneath of the Cruiser without damaging anything. I was thinking soak with Purple Stuff, toilet brush, & pressure wash (no more than 1,500 PSI). Will this be OK? Is there a better safer way? My concern is if oil can get out, high pressure degreaser can get in. Advice?