In hindsight, put a lot of vinegar, line away, laundry soda, etc in previous T cooling system to flush out junk and it worked like a charm. A week later, sure enough, freeze plug broke through. Seems the only thing holding them together was the rust that I removed. Not a deal breaker, I've got the cinkles, but is that a better solution to flush the cooling sytem that won't attack the freeze plugs?
I've got the cinkles
What are they?
You sort of answered your question when you stated: "Seems the only thing holding them together was the rust that I removed." The freeze plugs themselves may not have been dissolved by the chemicals you used.
If a layer of rust was the only thing retaining the coolant and you remove that rust, well, umm, er, you have a leak.
Replace all of the steel plugs with brass ones from the vendors, or nickles.
I know it's early, but what I'm hearing is flush my system with the strongest stuff that makes sense and then herd the buffalos.
Correct. The steel ones will rust out. Nickel or brass will outlast you, and probably the rest of the car too. Some people put the plugs in bare and have no leaks, but I add a bit of Ultra Black. Heed my note about what NOT to use.
Neat trick with the buffalo nickels, Steve! Thanks!