I head to Crunchy Betty any time I want a homemade cleaning potion. Here is her glass cleaner.   Windex Shmindex. Stay with Crunchy Betty.

ALVIN CORN Glass and Window Cleaner

1 c. filtered, very hot water
1/2 Tbsp cornstarch
1/8 c. rubbing alcohol (at least 70% isopropyl, if not more)
1/8 c. white vinegar

Boil your water and let it cool just a bit. Add cornstarch to your spray bottle, and then the hot water. Shake well to dissolve. Add the rubbing alcohol and vinegar, and shake again. Every time you use this, you’ll want to shake it up to avoid clogging the spray nozzle with undissolved cornstarch. Use liberally and happily. Smile.