Since the first refill, I been using this from wilkos or may have been aldi brand.
Its blue clears the windows a charm doesn't smell awful strong its ready mixed costs 1.99 for 5L.
I could use a different bottle that's more expensive but do not think mixing the red'ish pink with blue would be a good idea.
Yea the bottle is like 2 years old now it always sprayed fine for me.
But I avoid using in (Extreme temps) since if liquid freezes it nacks the pump up.
Edit :- Ready for another batch by the looks of this container