Another possibility is a local auction site. They will clear it, catalogue it, auction it, no hassle.
Just been to one where a chap died and a house full of his collection, mostly old test equipment, was sold at prices that amazed me. There was everything there, scopes, counters components etc etc, about 700 lots worth. At a 15% commission must have done well.
This was an industrial auctioneer, so used to this type of equipment, not certain the small town one would be anywhere near as good. Look at their previous sales, the catalogues, and what the lots got to judge.
You don't say where you are, as is normal, so nothing local to me will be of interest.