Quick answer
Streaks come from three things: cleaning in direct sun, using too much soap, and Calgary’s hard water drying minerals onto the glass. To clean without streaks, work in shade, use minimal solution, dry with a clean microfibre or squeegee in one direction, and — for the best result — rinse with low-mineral water. For a guaranteed streak-free finish, a pure-water clean removes the minerals entirely.
Why your windows streak in Calgary
Calgary is sunny, dry, and has hard water — a perfect recipe for streaks. The sun dries cleaner before you can wipe it; the dry air speeds evaporation; and the hard water leaves minerals behind. Beat those three and you beat streaks.
Step-by-step: streak-free DIY
- Pick a cloudy day or work in shade. Never clean glass in direct sun — it dries the solution into streaks before you finish.
- Dust and dry-brush first. Knock loose cobwebs, dust and sill grit so you’re not turning dry dirt into mud.
- Use less soap, not more. A few drops of dish soap in a bucket of water is plenty. Excess soap is the #1 cause of residue streaks.
- Wash, then squeegee in one direction. Pull the squeegee top-to-bottom (or side-to-side), wiping the blade with a clean cloth after each pass.
- Dry edges with microfibre. Buff the borders and any drips with a clean, lint-free microfibre cloth.
- Finish with a low-mineral rinse if you can. Distilled or filtered water for the final wipe leaves far fewer spots than hard tap water.
The tools that matter
- A proper squeegee with a fresh rubber blade (replace it when it smears).
- Microfibre cloths — not paper towel or newspaper, which shed and streak.
- Minimal cleaning solution — water with a touch of dish soap beats most sprays.
- Distilled/filtered water for the final rinse to dodge hard-water spots.
The catch with DIY in Calgary
Even perfect technique fights the city’s hard water — your final rinse still carries minerals that dry as faint spots, and upper-storey windows mean ladders and risk. That’s why DIY results rarely last as long as a professional pure-water clean, which rinses at 0 TDS so there’s nothing to streak. Compare the trade-offs in our DIY vs professional guide.
Want guaranteed streak-free glass?
Skip the ladder and the streaks. SudBuds’ pure-water system dries spot-free, guaranteed. Get a free quote today.
Frequently asked questions
Why do my windows streak after I clean them?
Usually one of three things: cleaning in direct sun, using too much soap, or Calgary’s hard water drying minerals onto the glass. Work in shade, use minimal soap, and rinse with low-mineral water.
What’s the best tool to clean windows without streaks?
A quality squeegee with a fresh blade plus clean microfibre cloths. Avoid paper towel and newspaper, which shed and streak. A distilled-water final rinse helps with hard-water spots.
Why don’t professional cleans streak?
Pros (like SudBuds) rinse with pure, deionized water at 0 TDS — no minerals to dry onto the glass — so it dries spot-free and streak-free with no toweling.
