DAG cleaned one of my Focotars but cautioned against having it done before I sent it in. He feels most lived in a bad envirnment and they are harder to clean than a camera lens and offered no guarantee of sucess. I had it done and it came out so so. The inside was really really bad to start, but it was one of the large front element ones that are fairly rare but are excellent and I was already sending in some lenses. Cost was $50. Less than the camera lenses that went with it which varied in price so I can`t figure out his pricing structure. I just send my gear to him, he sends it back with a bill, I send him a check. Works for me.
I have to admit the lens came from an enlarger used at the the Chicago Tribune and was abused daily for decades. It was the filltyest lens I have ever seen by a long shot
Now I`ll tell you the the original Focotars are optimised for 5x7 prints and work sort of oK to 8x10. The large front element design was second and is a vastly superior lens with a very flat field and can be used at 4.5 and will be sharp into the corners. Focotar 2 were the last and are very very nice. I would not get excited over a first gen Focotar. I have two former and one new later. Same with the black round head enlargers. They require a short neck bullb you can no longer easily get. The egg shaped grey heads take standard bulbs. They also have slots for filters, but unless it is the very last Focomat IC Color, you will have to build your own filter carrier. I built one for each VC filter I use. Some skill required.
You also need the antinewton ring "filter" or spacer under the condenser. They were optional and are worth as much as an enlarger today.
If you work around all this, the results are superb. If you can`t, they are a pain in the ....
Tom A posted a pic of his darkroom a few weeks ago. It has a Focomat IC and IIc in it. What does that tell you?
Other lenses may or may or may not work in autofocus, but can be manually focused. There is nothing like a good Focotar though. I tried them all.