Drain cleaner explicitly locked to use on a kitchen sink next to rubbish disposal? I'd use the key to the rubbish disposal but unfortunately the society...
I'd use the key to the rubbish disposal but unfortunately the society that lived here before me any lost it or took it with them.
:(
Answers: a devout plunger is Best and can double to free stuck disposals.
Use a drain cleaner and you'll be buying a new disposal. The "KEY" is only an allen wrench, you can get one at hardware store. There are different sizes. It would assist if you tell the store what brand disposal it is.