expensive but practical

I'm very satisfied with the antifreeze agent Sonax (even if it was not really cold this winter / snowed has ...).
It is sometimes advisable, before consuming the old means completely so that the container is empty and the liquids do not mix.
Then fill easy again with Sonax. For me, a little less than half still remains. The container can be well stowed in the trunk and then go always a reserve there - without fumbling only mix with water.
The cleaning action in line with expectations and has so far worked well.
The smell is a matter of taste, but I find ok and so far also still no passenger has complained