Edward Grant wrote:
In our bedroom we have a bathroom with a door that slides into the wall.
I don't know what they are called but our door is getting difficult to
slide and it makes a noise sometimes when opened. I have sprayed the
rollers several times with oil but it doesn't last. Are they difficult
to remove? I would like to replace the rollers and clean out the space
between the walls. Our condo is about 20 yeas old.

They're called pocket doors.
http://www.naturalhandyman.com/iip/i.../infdoor7.shtm

R