Same Three's Company episode has a restaurant busboy using a Royal upright with a blue bag..... 



The Kenmore "commander" rocket style tank cleaner would have looked perfect cleaning the Batcave.I wonder if Alfred ever used a "bat vac" to clean the bat cave in the 1966 TV series or one of the movies? I seem to recall an episode of him cleaning it with a feather duster, but maybe that was in the Bruce Wayne Manor.
It's unlikely that he did, but it's a fun thought. If nothing else, it would be something to look for in bat cave backgrounds.
That's good for your intellectual development, vision, et cetera—glad to hear that. While I have no TV hookup, I sometimes catch those shows online.I don't watch TV, but watching these scene clips is quite interesting.