Do what you will about cleaning and researching what can be done to mitigate issues, etc., but in the long run, you'll need to eventually turn it on and start printing. I suggest getting some cheap paper, the maximum width and start printing print after print, which should pick up whatever ink or stray spillage. Once you have a clean print, try printing one with a super light grey or whatever, just really very light and see if anything comes up on it. If the printer hasn't sustained damage, you're probably good to go.
I deal with a lot of equipment and I've learned over the years that often just getting the thing back up and running is the best for it. Short of a tear down, and thorough cleaning, eventually you will have to plug it in and turn it on.
If you're totally concerned about it, or bad feelings persist, invest in a extended warranty if available and get a tech to come take a look at it. He'll probably check it out then turn it on, then start making prints...
Good luck - hope it's minor. BTW - I'll bet that elevator floor never looked so good then after you cleaned it, LOL. Stuff happens, right?