Hi jetter, We literally have buildings miles apart with fiber between them. Fiber is great when working well, but it's a pain when it's not. I don't know if they sell tools to clean Toslink connections, but we use tools that look like they have dental floss in them to clean fiber. The quality of the glass, the method used to polish the ends, all come into play. I use coax at home, I don't need to send 100 gigabytes a second, or to deal with the issues that accompany fiber, I get enough of that at work. I am not a fiber expert, we use specific cables based upon the amount of data we expect it to handle and the associated switches and associated equipment. We don't use Toslink, I don't know if it was ever used in networking, I haven't been working with networks for that long. This opinion is worth everything you paid for it.
Lou