Finally got around to thoroughly cleaning my rad. Used Nu-Calgon 429108 Nu-Brite condenser cleaner, and I highly recommend for anyone who wants to get a better clean without having to take the rad out. I was pretty impressed with how much crud came out after I had spent many hours washing and blowing due to an overheating issue I was chasing down. Happy to report that my overheating also appears to have resolved itself after the cleaning. So flushed the rad, changed out the stat, new coolant, good burp and thorough clean and each time the overheating got better but now it seems to be back to normal.