I use a little cheap one that Frankonia sold. It was weird, it came with a cleaning solution that had an odour like I could remove copper with it! That would have been bad news.
I mix water and white vinegar in about equal parts with a little dishwashing liquid. I tried a few things. I need about 15min to get the job done.
Mine is way too small, so I put short whisky glasses upright in the unit and fill the glasses and stand the cases upright.
I'd get a bigger unit first time around if I were you, but I wasnt' sure I'd be happy to use it, or with the results and didn't want to spend a pile of money on (another) an item I wouldn't use much.
I don't think it really adds to performance, but I do it anyway.