My ex, a native Baltimoron...er, I mean "Baltimorian", used to not only say "Warsh", but he also said "zink"...As in, "Gonna have to warsh the laundry in the zink, cuz the warshers broke". I have *no* clue why there's an r in wash...unless they were trying to use up all the r's that the New Englanders don't use.
And I am even more clue challenged as to why there is a z in sink.
;D