3) At the next stage, we have a verb compound to carwash through backformation
What I hear is a pretentious backformation
that draws attention to its inventor without benefit to the reader/listener.
Note that the sentence John is friends with Bill is an analogical backformation
based on John and Bill are friends.
16) Whether or not such an addiction to the way musical echo effects can make "dying words live," as the poem "Far-Far-Away" would have it, is the essential Tennysonian impulse, that possibility may at any rate be read as an interpretive backformation
of a Symbolist emphasis upon the force of sonal repetition.
They only possible exception I found is in drink (* beer) hard, but drink hard seems to be a lexicalized backformation