It is a python script, you need the praw library. The client id’s are given in your profile after you create an app.

  
import praw

reddit = praw.Reddit(client_id='yourid',
	client_secret='yoursecret',
	password='your password',
	user_agent='deletes my comments',
	username='your username')

redditor = reddit.redditor("your username")

for comment in redditor.comments.top(limit=10000):
	comment.edit("deleted")
	comment.delete()

You can edit and delete everything in the same pass but I prefer to overwrite my comments first and give time for the cache machines to register my new garbage before deleting with another pass.

Here is a sanitizer script that uses nothing but javascript

https://github.com/ryanford/Reddit-History-Sanitizer/blob/master/RedditHistorySanitizer.js

Open a tab, login to your account and go to your account page aka reddit.com/u/usernamehere (you likely need old.reddit version of your account, its all I use). Install tampermonkey and the script into that… It will iterate through your comments, overwrite them, then delete and refresh the page as it goes.

Change the line here:

const age = 7

to

const age = -1

To delete all comments. You can adjust that number (in days) to how old you it to filter for comments.

https://github.com/j0be/PowerDeleteSuite