jalopyjournal
Even Morgan, Walls & Clements designed one. It was at 920 S. Western Ave. Not visible here, but just to the right is a lot offering free parking for patrons of the Fox Uptown Theatre down the street. Good pictures of the car wash online are elusive--it took me forever to find this fuzzy copy of one taken by Dick Whittington in 1927. I couldn't find it among all the Dick Whittington pics in the usual libraries. (If you happen to see a copy of Richard Longstreth's [incredible] book
The Drive-In, the Supermarket, and the Transformation of Commercial Space in Los Angeles, 1914-1941, there's a much sharper print of this shot in it.)