I have about 4 websites that were infected where I don't have a recent (as in the past year +) database.
How do you clean out a database? I've read the articles (https://www.stopthehacker.com/2012/06/19/cleaning-up-malware-infected-websites/ ) and things like this... just fly over my head:
Check if your database is compromised with malicious scripts and iframes. The following SQL code will help to mine out posts that are in the WP install.
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SELECT * FROM your-table-name WHERE your-table-field-or-column LIKE '%<iframe%'
You should you-table-name to whatever the names of the tables are in your database and the columns appropriately and then you can see if any injections are there in the database or not. You can then drop the entry you want.