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Take the two screws off of the lever/overflow handle. Once removed you carefully pull the handle and ring out. As you do this a wire will also pull out. Attached to that is an adjustment device, threaded rod of sorts, Then at the end is a brass or plastic plug.
Once pulled out you need to flush water down the drain. As KMS said hair, soap and gunk can prevent that plug from moving back and fourth which opens and closes the stopper.
Once you have successfully flushed the drain, replace the stopper and assembly back into place.
If by chance that does not stop the slight leak, pull the assembly back out again, and turn the adjustment threaded rod just a few turns to make the length just a bit longer overall. Two turns at a time only.
Then replace the assembly once again and test it. If you adjust it to much the stopper will not stay open and the tub will drain slowly. It just takes a few tries to get it right. But before you do any adjustments, clean the drain.
Once it is working properly, be sure to tighten the screws tightly on the handle/vent assembly. This has a gasket behind the tub that assures that no water should the tub overfill drip out the back.
I you can imagine a brand new shiny piece of furniture....then rub that surface with some super fine sand paper....the finish will no longer be shiny...this has to do with the "abrasion" of the finish where the light rays no longer reflect. This same process happens to a floor but instead of the sand paper is is normal dirt and grime over many years.
The second area is cleaning residue...imagine that same shiny piece of furniture now add some dilute dish soap and let is dry on the surface hear you will be left with a sticky dull residue...this residue will attract more dirt and contribute to problem no 1 above.. In the soap residue dept a though a complete "rinse" can make it look better.
If you could send us a photo of the fabric I might be able to give you some suggestions.
We have cleaned many pieces of furniture that had a cleaning code of "S" solvent. With steam extraction and differen't type of cleaner's.
You can e-mail photo's to firstname.lastname@example.org