So from what I know, the only real difference between sterling silver and fine silver is the purity, they mix metals in to give it strength, so in theory, if you have different metals mixed in with your silver they could react differently to cleaning chemicals and so on even more so than here, it just depends on what the silver refiners have done to the metal.
That could all be down to chance though whether it affects it or not too, so really I would just recommend prevention to be on the safe side. The idea is you simply don't want any weird chemicals coming into contact with the silver otherwise it either oxidises as I showed in the first photograph or does something even worse.
People forget that what they're buying is a genuine silver so the last thing you want is to dip it in something weird and then have it shrink or react oddly to what you're doing. One thing I would say though with fine silver in particular is it is a lot softer and I mean really soft compared to sterling and you could easily just end up crushing or squashing it if you're not careful.