I'm not sure a wash will get all the grease off. Acetone will eat it if it sits, (solvents like that are in spray cans too) but I have given P-coat a quick light wipe with it to prep, it will slightly dull. do a test area, fog the first coat of paint and try the forks first.
I figure Fusion and copy cats might stick better because they are for plastics and P-coat is similar. They come in all colors and can be found on sale sometimes.
Post it up when your done. I need to do mine too and that's how I was going to do it. :thumbsup: