Vinegar, Windex, or Pure Water: What Actually Cleans Portland Windows Best

This is one of the most-searched window cleaning questions out there, and it deserves a straight answer instead of a sales pitch: does vinegar work? Does Windex? Or is a professional pure-water system actually worth it?

Vinegar

Diluted white vinegar is a genuinely reasonable low-cost option for a quick touch-up between professional cleanings. It cuts through light grime and dries without the heavy chemical residue of some commercial cleaners. The catch: it doesn’t match a pure-water system on hard-water spots, and it can leave a faint film of its own if not rinsed thoroughly — which is part of why windows cleaned with vinegar sometimes look dirty again within days.

Windex and Similar Commercial Cleaners

Convenient, but the same underlying issue applies: most commercial glass cleaners leave a light residue behind that acts as a sticking agent for dust and pollen. That’s not a knock on the product — it’s just what happens when you’re cleaning with tap water and a chemical solution rather than mineral-free water.

Why Pure Water Outperforms Both

Professional window cleaning increasingly uses deionized, mineral-free water on an extendable pole system. The mechanism is simple: ordinary tap water carries dissolved minerals that dry into visible spots on glass — that’s the actual cause of streaking and spotting, not dirt. Deionized water has those minerals filtered out, so it dries completely clear with nothing left behind. No chemical residue, no mineral spotting, and results that hold up noticeably longer than a vinegar-and-rag approach.

The Honest Bottom Line

Vinegar is a fine stopgap between professional visits. It’s not a replacement for one — especially in a climate like Portland’s, where rain, pollen, and moss are working against your windows year-round. If you’re cleaning your own windows regularly and still not happy with the results, the water is very likely the actual issue, not your technique.