Radiator flush

Sorry for any thread jacking.
Are there consequences to the vinegar?
>>>>Where do you guys put the flush afterwards?<<<<

After having to get-rid-of a few chocolate-milk-mix oil & antifreeze mix from blown gaskets, I was dumping old anitfreeze in the parts stores' oil bin. That's not a good idea, but I need an alternative. We recycle paper, plastic, metal, and all batteries at work - how about antifreeze?
I got 4 cars in the driveway with combined 3/4 million miles on them and I need to flush.