To remove formatting from field contents, try the method below.
Note: make sure you have a current backup BEFORE doing this in the event that something goes wrong!!!
1. Records > Show All Records
2. Click in the field you want to update
3. Records > Replace Field Contents...
4. Click the Specify... button next to Replace with calculated result
5. Enter TextFormatRemove ( yourfieldnamehere ) for the calculation
6. Click OK to close the Specifiy Calculation dialog
7. Click Replace to perform the unformatting
See how that goes.
That's it! Worked fine, thank you.