cooling not so cool

Here is what I did to my rad, set it down on the driveway with the inlet and outlet pointing up, put the rad cap on and filled it with white vinegar, took about 1 gal. Let it set for a couple hours maybe 3 and drained it out, all kinds of sh*& came out I couldn't believe it, flushed it with garden hose for a while and put it back in and it worked a lot better. The best part is it only cost $2.00