Manually installed Alexa but it is too complicated, how do I delete it?

I went the manual long way and got Alexa installed (through Amazon Developer account, Lambda aws, etc.). It is way too complicated to get all my scenes, automation and other things going and I am running into too many issues and I just want to remove all instances of Alexa from my HA. I think I am going to try the Nabu Casa way but before I do that, I want to remove anything/everything Alexa related from HA. Can someone tell me how to do that?

On the Alexa app, I removed all skills and devices.