We Moderators cannot delete those comments/reviews.
The best way is to alert your own review by clicking the yellow triangle ! sign, and report yourself.
I was posting a review and I screwed up a bit. I thought of one thing and added it as a reply. Then I thought of another. Seeing that it put in the same text as before automatically when replying, I assumed it would update. I then thought of yet another. Now I have 3 replies that I don't want. I forgot that you can update a review. I just did that with the text.