Yes, I think there is.
Open the desktop version of YouTube and go to your settings.
Click 'Channel status and features'.
Click 'Advanced settings'.
Scroll down to the bottom of the window and click 'Remove YouTube content'.
Select 'I want to hide my channel', tick the boxes, then click 'Hide my channel'.
I think this deletes all of your comments when it does so, and when you 'un-hide' your channel, they should stay gone. This won't get rid of your playlists and other stuff either.
Other than that, I don't know any way of doing it.