Looks like ive thrown a huge spanner in the works here... Whoops 
I just thought I would check to see the actual coshh sheet. I have been covered in anti freeze and screen wash over the years, I use screen wash in my bucket when cold. I have drained radiators and got covered in the stuff. not dead yet :

I think antifreeze has a higher quantity of ethanol in it and that may be the poisonousness part, I don't know.
and the safety sheets said screen wash was a flammable liquid which is no big deal really.
antifreeze was classed as a harmful substance on the coshh sheet