Is the string actually 'soaksoak'? There are a few methods of searching the database for strings of text. This link (answer number 5) shows how to do it with phpmyadmin.
http://stackoverflow.com/questions/562457/search-for-all-occurrences-of-a-string-in-a-mysql-database
This gu wrote a script to do it (use at own risk)
https://tequilaphp.wordpress.com/2010/07/05/searching-strings-in-a-database-and-files/
It would be interesting to see where it was. Let us know.
tim