I've binned a tankful of 007 before. Highest I work with is 002.
Daft I know but I have standards.
If 007 gave you the same results as 002 seems like waste to chuck away
and not higher standards. 
Or use tap water..
Only if have a real low tds,unlikely to have problems on hydrophyllic
glass can be problematic with hydrophobic glass.
Soupy please dont recomend this please, you arenot talented or
imformed enough..no offence intended 
No offence taken.
I'm far too stupid to use anything over 000. Besides, I actually believe all that bull that I tell my customers about purified water. Daft git eh?
Nope 000 works but so can a low tds...I don't think most customers care about
the whole pure water thing as long as their windows are cleaned, cant count the amount
of times in the past I have gone through the whole pure water malarkey with
a customer and a few minutes later they come out with if you need any water there is
a outside tap
.
These days if I get that offer the tds meter comes out and if I think its appropriate
I plug in blast away then blade all windows dry on a pole etc,cant make it look too easy
. I had one customer
after watching me decide he was going to do them himself the next time I was
in that street he asked me to do them again, he had blasted with hose pipe and
spent over 3hrs trying to blade them..leaning out of upstairs windows etc
Apparently he had better things to do with his time
,these days if a customer
asks me about WFP I sell on the safety aspect to myself and to their property
more privacy to customer blah blah and how I try to be environmentally friendly
by rainwater harvesting whenever possible...the purity of the water never comes into
and no one ever asks.