Get one of these!:
https://www.amazon.com/gp/product/B071HYRPND/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
Seriously. For $20 I can't believe it took me this long to buy one.
My take was shocking clean inside. Was kind of a let-down honestly. Was looking forward to my first...
My '05 was left to sit outside for five years before I got her. Not ridden, not started. My gas cap was corroded to the point that inserting the key just disintegrated the tumbler. Ended up having to drill it all out.
Aftermarket caps are a great, cheap option. I got this one off Amazon...