I have never had any luck cleaning windows..have tried different solutions, rags, etc.
I was polishing my car with Klasse all in one, back of bottle says use on glass,,tried it..WOW amazing results..inside glass you have to be careful not to get on trim, guess u could tape it off..

 

I use Adam's glass cleaner and newspaper on the exterior and the same special glass cleaner with a terry cloth towel on the tinted windows inside.

 

After talking to a professional window cleaner, I found that water/vinegar/dish soap is the best. I use this formula spring cleaning the house and the weekly car cleaning.

I haven't bought any glass cleaner (windex, etc) for 3 decades.

 

Honestly, I've found that it all comes down to technique not product... you need 2 MF towels, one to use with your glass cleaner of choice and another to buff off the product and remove all residue.

 

What ratios do you use when mixing this up?