Thank you for using the Apple Support Communities! I see from your post that you are having trouble with Touch ID on your new iPhone 8 Plus and now the iPhone is disabled.
First, I'd like to say congratulations on your new iPhone! I know it's definitely a bother when certain features will not work as expected on a new device, and I want to do what I can to help you as much as possible. You did a great job troubleshooting and isolating any possible issues with your hands by washing them and making sure the Home button was clean.
In addition to doing that, I would also recommend you try the steps found here in this article called: Get help with Touch ID on your iPhone or iPad .
I hope this information is helpful!