A substance used for cleaning, a cleaning agent.
A professional laundry or dry cleaner (business). (This form is now interpreted as plural and usually spelled without an apostrophe, even in official usage, to justify the removal of the apostrophe. It was traditionally spelled cleaner's with an apostrophe because this is grammatically correct, as can be seen with forms such as go to the doctor's, which cannot be reinterpreted as plural.)
A person whose occupation is to clean floors, windows and other things.
A device that cleans, such as the vacuum cleaner.
A liquid crystal having the molecules aligned in this way.
Astringent; detergent.
Describing a class of liquid crystals whose molecules are aligned in layers, with the molecules lying perpendicular to the plane of the layers.
Cleansing.