findstr /i /c:"<text to search for>" *
For example: findstr /i /c:" ^ " *
Searches for the ^ symbol with a space around it in every file in whatever folder you're in. After you clean up those, you can do it without the spaces, which will find many more matches.
Technically, the /i isn't needed for searching symbols, since that means that your text is marked case insensitive. Skip if you like... I toss it in as a standard thing since it's easier not to think about it too much.