Using the free Cleantalk plugin may be the simplest solution to dealing with your WordPress spam comments.
One other option is to manually delete spam comments. It's possible to bulk delete the spam by viewing 100 (or more) comments at a time instead of the standard 20. This makes it faster to manage the spam.
But to get the spam away and keep it away, a more permanent solution is to use a good plugin. And the Cleantalk plugin is the recommendation here. Check out how it works in this video.
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