I’m using google chrome.

These images are lagging the browser, so I need away to access it and clean it all.
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You are asking how to solve the wrong problem. If your high-frequency ajax calls return images that they don’t need, then you are making bad ajax calls. Deleting the files would be treating a symptom when you should be treating the cause.
Find a way to not download them in the first place. The result of an ajax call can be scoped, filtered, or even parsed manually. There’s no reason to allow the full result of your ajax call to store these extra resources that you don’t want. If you want to know specifically how to do that filtering, you’ll need to post the code that generates your ajax calls.