Yeah, I agree with the "flush, flush, and flush again" theory. If it was automotive antifreeze, I'd be flushing, a whole lot, first, and then sanitize with the bleach solution. Get as much of that green stuff and residual taste out as possible. It probably won't need too much sanitizing, since green automotive antifreeze is pretty toxic and will kill just about anything. Your system is very likely sanitized now, albeit in the wrong fashion. Just getting all the green stuff out is going to be your biggest challenge. I'd still do the bleach anyway, when you're done...it'll be yet another rinse to get the green out! Good luck!
2015 XLR Hyperlite 30HFS5 (mods being performed regularly)
2009 Salem LA 292fkds (gone)
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2011 Ram 2500 CC 4X4 CTD, B&W Companion (toy hauler hauler)