The switches are not that hard to clean. Not too hard to get to, either.Very nice work Cinic! Thanks for posting the pictures. Both of my B-2's are misbehaving right now because of those nasty switches; it's very annoying and because I've only ever had one source connected to it/them and I've never change the attenuator settings since I've owned them I'm thinking I'm going to add some jumpers to that board soon to remedy the problem. They can always be remove later if new switches become available.
Once cleaned there will be no measurable resistance.
The pots clean out well too. No need to replace them either.