Using brake cleaner to clean a gun can often help get carbon and other gunk from crevices where q-tips can’t reach. It’s also excellent at removing all oils, grease, and other petroleum products from metal.
In that regard, it’s very handy.
On the other hand, when the spatter and overspray from the nozzle happens to land on — and partially dissolve — the vinyl cover one’s wife put on the patio table to keep away dust, it’s a bit more of a liability.