Unwanted linetypes and text styles unable to purge

Hi,

We have a problem in our office. In some of our drawings we keep getting a lot of unwanted linetypes and text styles. Nobody is sure where they originated.

We have tried this method in getting rid of them but it doesnt work. http://usa.autodesk.com/adsk/servlet/ps/dl/item?siteID=123112&id=18809891&linkID=9240617

See attached file.

Same applies with the text styles.

Thanks