How do I automatically remove special characters within Dreamweaver

I’m developing marketing emails and occasionally I get some obnoxious little square character instead of an empty space. Sometimes I’m unable to remove it by deleting the space around the area where the character seems to exist.

Basically, the character is rendered in certain email clients. Not in most browsers. I believe there is a tool/function in Dreamweaver that automatically removes these hidden characters. I don’t remember what it is. Does someone know? I am familiar with the “show hidden characters” function but I am referring specifically to the auto fix function that is hidden somewhere. Thanks in advance.

Did this code come from something like MS Word?