Many here say Warshington, and warsh, like "warsh the car".
It's pronounced that way in Maryland too. Hearing someone wahsh reminds me of California surfer talk. "Dude, let's wahsh the car."
Older people in Baltimore have strange accents too. My grandmother used to say 'piller' instead of pillow and a refrigerator was always a 'Frigidaire' regardless of the brand.
My great grandmother (from Virginia) spoke with an accent that almost sounded British; she was she was practically fresh off the Mayflower, so it was understandable. Everything was very proper (she was never called Mom or Grand mom, but Mother and Grandmother), and she didn't overly-pronounce her 'r's.