Has anyone tried this for cleaning your airbrush every so often? Would it eventually start eating away at the brush like windex?

I used it when I have sprayed lacquer based paints. I dont think it will hurt the metal at all.

You can use lacquer thinner but if you shoot water based acrylics, I recommend water based airbrush cleaning solution to soak your brush overnight occasionally.  It's economical and does an excellent job of loosening up acrylic paint.  The needle packing in the barrel of most airbrushes is solvent resistant nowadays, but resistant is not solvent-proof.