If they are painted shut you can score them with a utility knife and then attempt to open them.
How to clean glass sliding doors.
If they are aluminum spray the sides liberally with l c wax aluminum lubricant for windows sliding doors and awnings.
Wet the entire surface using a clean rag saturated with water and soap.
Be sure to clean the tracks on both sides of the door.
For routine cleaning use a broom to sweep the area around the exterior of your door.
Keeping the outside area around your sliding glass door clean and tidy will help prevent dirt and debris from entering the track.
Your sliding glass will probably have a hole on the side.
I ve used this many times and it works greats.
Dry thoroughly and apply a thin layer of lubricant oil or spray lubricant to the track.
Clean the track to your sliding door every few months with a wire brush.
Tip the glass door from side to side and turn it over periodically to make sure the alcohol is reaching all parts of the inside of the glass.
Spray the door and leave wait three minutes.
Wipe clean with a microfiber cloth and buff any streaks with a clean dry cloth.
Squirt the alcohol through the upper tube to fill the glass void.
Attach a dental waterpik to a container of glass cleaning alcohol.
Look for the hole in the door over the tracks or on the inside of the door.
Once open sand the sides best you can for easy opening.
Ammonia can help make a streak free finish for glass after the shower doors are clean.
It also helps to lubricate the tracks to your sliding doors every few months.
Combine 2 tablespoons ammonia with 2 quarts of warm distilled water in a large spray bottle.
Bits of leaves bark gravel and sand are just some of the things that can get into your door s track and prevent it from gracefully sliding.
Place the straw attached to the lubricant into the hole and press the trigger.
Use a miniature vacuum to remove any of these loose materials.
Use a rough damp cloth or scouring pad to clean the door frame bottom and threshold which are likely to be ingrained with dirt due to frequent traffic.
Wipe down the entire frame with a damp cloth.
Spray lubricant into the hole on the edge of the door.
The brush will loosen stubborn dirt deposits which you can then vacuum.
Wipe the frame around the glass and edges of the sliding door using a damp cloth.