There are two main areas you need to pay attention to when cleaning your patio door. First and most obvious is the glass. Notorious for fingerprints and exterior dirt build up, patio doors have large glass panels that can easily be cleaned with any glass cleaner and a clean cloth. The second area to pay attention to is the tracks. Gunk, grime and debris can build up in the tracks and affect the smooth operation of the doors. You can use a vacuum to clear out any larger pieces of debris and a moist cloth to wipe down the tracks periodically. This will ensure the tracks and rollers are not damaged or affected by external factors.