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Yes, you can replace just the glass pane in a window without affecting the surrounding frame. This is a complex process, so it is best to hire a window repair professional to handle the task. A technician will cut the seal, remove the old glass, install the new pane, and properly seal it. For double-pane windows, this includes creating a vacuum between the panes and filling it with insulative gas to restore energy efficiency. Professionals can also help you choose the right type of glass for your window. This repair process is almost always more affordable than replacing the entire window unit.

A window may fail because of age, defective mechanisms, or moisture. Depending on the issue, the window may be fixed with simple repairs. Otherwise, you’ll have to invest in replacing it. You can avoid damaged windows but keeping up with window maintenance.   

There are a few reasons your mirrors might have smears on them after cleaning, but the two most likely are remaining cleaning product and minerals from hard water. If you used a commercial glass cleaner, consider spraying down the mirror with a 1-to-1 ratio of white vinegar and water after cleaning and then wiping it dry with a cotton cloth. If you suspect hard water is the issue, use a cotton ball soaked in rubbing alcohol to spot-clean the streaks, and then let the mirror air-dry.

Yes, you can replace just one pane of glass in a sliding glass door, but you may need to contact the door manufacturer directly to get the proper dimensions of the pane. It’s also worth checking your door’s warranty, as various parts may be covered for a particular timeframe, so you may not have to pay for the replacement pane. But consider the condition of the rest of the door. If the door is old or in bad shape, replacing the entire door is probably more cost-effective.