Greetings Joe,

There is quite a bit about sliding patio doors posted back on December 22.

The first thing you should know is that you shouls never use any kind of spray on the wheels of the door because it causes dirt, dust, pet hair, and any other type of desbri to clog the wheels.

Sweep and vacume the track often and your wheels should last a long time.

I am assuming that this is an aluminum sliding door and you may want to check the track to see if there is wear on the track. If so, you should check into capping the track with a stainless steal cap from C. R. Laurence. (they have a site)

I hope this helps.

Good luck,