Just bought a lake home and it has 2 sliding glass doors on the end. This house was neglected for more than a year. The doors do not slide well. I had to remove a lot of debrie out of lower tracks. Hoping to use air compressor and blow out balance. If not, will have to take them down and possibly replace rollers. Would rather not have to replace both doors. Any suggestions.

You mention condensation in the heading and the debris in the tracks. Actually, removing the sliding door part is relatively easy. Lift the door up and away from the track. At least, grease or oil the rollers. If the condensation in between the glass, nothing you can do, the seal is bad.

Brian nailed it. Seal is bad. Need to replace glass.can be done by any glass company.

Chuck