I did the same, but not to the same standard, on the challenge bike.
First proper introduction to soap and water for a few months / years, I think.
Fluids and filters will be next, and then fix the slow leak in the petrol tank. I gave the chain a thorough clean, and there are a couple of stiff links in there. I think that'll need to be changed, so I'll get that done when replacing the rear tyre.
Before (if it wasn't obvious!)
After