Substitute smart double quotes with straight double quote
I'm trying to use the substitute function to straighten quotes in a text field. There is no problem using the substitute function to replace smart single quotes with the straight single quote of course but I cannot get it to replace smart double quotes with a straight double quote. In the replace part of the function I am using the backslash to escape the double quote so the replace looks like this: "\"" however FileMaker Pro won't work with that.
So can anyone suggest a way of including the straight double quote in the substitute function, or maybe suggest another way to straighten double smart quotes.