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Deciding whether to repair or replace a window depends on the specific issue, the window's age, and the cost-effectiveness of the solution.

Repair is often better for:

• Minor issues such as a single broken glass pane, a stuck window, or small leaks. Repair is typically more affordable for isolated problems.

Replacement is the better long-term solution for:

• Major problems like deteriorating or rotting frames, significant leaks, or drafts.

• If your windows are over 15 years old, as repairs may only be a temporary fix for an aging unit.

• If you have a widespread problem affecting several windows.

Having a professional caulk your windows will cost you around $50 to $70 per window (or $1.25 to $4 per linear foot), including labor. However, caulking is one of the easiest DIYs there is, and you’ll save a lot of money by getting the supplies and doing it yourself. You’ll only pay $0.05 to $0.20 per linear foot if you DIY this one. Finally, different types of caulk don’t vary too much in price, with most tubes costing no more than $15 apiece (but typically only $3 to $10) at the most. 

The most likely cause of smearing or streaking after cleaning your windows is residue left on the glass from the cleaner you’re using. Consider diluting the solution and cleaning them again, or use old newspaper to dry the windows after cleaning, as this will soak up any residual material. Additionally, aim to clean your windows on a cool, cloudy day, as cleaners will dry more quickly on the glass if it’s hot and sunny, promoting streaking.

If the existing frame around the window sash is completely structurally sound, it's possible to save money by swapping out the sash for a new one instead of getting a new window. Keep in mind that it will be necessary to find a new sash that perfectly matches your existing window structure. In general, consulting a window pro to help you find the right match is the best way to ensure you're doing this project correctly.