Streaks aren't a product problem. They come from drying time, technique, and working in direct sun — and all three are easy to fix.
People blame streaks on their glass cleaner. It's almost never the cleaner. Streaks come from solution drying on the glass before it's removed, from wiping with something that redeposits residue, and from working on sun-warmed windows. Fix those three and the product barely matters.
Start with the timing. Never clean windows in direct sunlight. Warm glass dries the solution before you can pull it off, and that dried film is the streak. Work on the shaded side of the house and follow the shade around as the day moves.
Dry-dust the frame, sill, and track first. If you go straight in with liquid, you turn loose dust into mud and drag it across the glass. Thirty seconds with a dry brush or cloth beforehand saves several minutes of correction afterwards.
Use a squeegee rather than paper towels or newspaper. Wet the glass with a mild solution — a little dish soap in water is genuinely fine — then pull the squeegee in overlapping strokes, wiping the blade dry with a clean cloth after every single pass. That wipe is the step people skip, and it's the one that determines whether you get streaks.
Finish the edges with a dry microfiber cloth, and use a second dry cloth on the frame and sill so nothing runs back down onto clean glass. Clean the inside and outside using strokes in different directions — vertical on one side, horizontal on the other — so when you spot a streak you know instantly which side it's on.
One tool note: a rubber squeegee blade is a consumable. Once it nicks or hardens it will leave a line on every pass no matter how good your technique is. Replace it rather than fighting it.
Interior window cleaning is included in our deep cleaning and move-out services. If your home or business has a lot of glass and you'd like it handled regularly, just mention it when you request your estimate.