The most useful key in the keyboard is...

time to read 1 min | 69 words

The little DEL one. I keep telling people, "you have source control, just delete this stuff." There is also nothing as satisfying as working with someone when you just select a couple hundreds lines and delete them. The expressions are priceless.

Delete as much code as you can, it means less stuff that you'll need to puzzle out in 6 months time.