On Youtube? Detection and deletion.?

I'm in the process of closing my account for a variety of personal reasons. I want to go out without a record. I have deleted all my videos and erased all my comments made on my videos and my page by me and others. I have also searched and deleted every comment I found that I made on youtube on other peoples videos and pages. I want to delete everything before closing my account. I want to delete all comments I made on other peoples pages and videos. The problem is I had this account for over four years and there no way I can find them all or remember them all. Is there some kind of record that google has (or Youtube, owned by google) that list all comments ever left by me that I can access so that i can find them and delete them.