Can you explain what is exactly done by the bot?
If you checked each image, it isn't so different than using multiple
tabs for deleting.
I used a tool (I forget the name) that checked the usage of each image, and what was in its description. Using this, I removed any images that had a lot of uses, and also images that had no issues. With the rest, I put them into a python script and had the pywikipediabot do the rest.