Rodding out a radiator

[Afordman31]

Three days ago I took a 30-31 radiator that I had run a few years ago and replaced with a new one because it was plugged up and would overheat.
My Dad said for me to unsolder the top tank being careful not to get everything to hot so as not to unsolder the flues.
I removed the top tank, took a piece of flat stock 1/8" x1/2" milled some off the 1/2" side so it would just slide into the length of the flue opening easily.
I had to thin the 1/8" side also. The length was app. 24 inches long.
There are 102 flues in the radiator. I also used a piece of 1/8" round stock first to open up the radius ends of the flue, followed by the flat stock I made.
After all was clean I flushed the flues and the bottom of the tank out.
I finished melting out the solder that was left from removing the top tank, cleaned everything then used muriatic acid and a acid brush to get it clean.
The next day I put flux on my parts to be joined and began soldering with a turner propane torch, then after the solder sucked into the spot I was soldering I would wipe it with a rag and the joint came out really nice.
I used the same flux and solder that I have used on rigid copper plumbing and this worked really good for the radiator.
The radiator is back on the car with no leaks. Afordman31