Thank you Ryan!
I delete the spam manually in the CP -> comment module. That isn’t a problem. I do it every day. It works fine. After I deleted it, the spam isn’t on the website any more.
Also it isn’t any longer in the comment module.
But: It stays in the mysql database, table exp_comments. Over 3500 spam comments, 25 MB. So the ee database will be bigger and bigger. In an future time it may not be usable for backups, reinstalling, upgrading, because it is too big.
I want to delete the spam out of the database table exp_comments.
“may have to run a sequel query to delete the spam. Is that something you’re comfortable with or know how to do?” - Sorry, I don’t know, how to do.