Say I have the following style of lines in a text file:
\"12\" \"34\" \"some text \"
\"56\" \"78\" \"some more text\"
.
.
.
etc.
I want
Type: :s/\%V"//g
which would result in the following command:
:'<,'>s/\%V"//g
Press Enter and this will remove all "
occurrences in the selected block.
See: Applying substitutes to a visual block at Vim Wikia