I used to use windex for my glasses before I first bought glasses cleaner. Let me explain, I’ve always had bad vision but I had thought it was normal and I just needed reading glasses all through elementary school. In middle school people would always trade their glasses with me to see how blind we were bc you know ppl with glasses do that lol anyways 8th grade I realized these don’t even do my eyes any justice so in freshman year I told my mom for my next eye doctor appointment (I have an eye check up every two years) I gotta get tested for everyday use glasses and they gave me some. Since I started wearing them more often I noticed how dirty they’d get easily and I didn’t have glasses cleaner bc even though me my oldest sister and mom are also blind that use glasses there was no glasses spray in the house so I thought hmm it’s glass and what else is glass ? Windows. We have window cleaner so I got the big bottle of windex and would spray a little bit on my glasses then went on with my day. Then I finally bought glasses cleaner maybe a year or two later