I tried Oxi Clean and Shimmer Lights to remove the paint, they did not work
Finally, I tried Acrylic Liquid mixed with isopropyl alcohol on one of the keycaps, and voilà, paint gone without damaging the plastic.
I decided to remove all the Keycaps and clean the keyboard plate. The keyboard plate was filthy and disgusting!
after sacrificing a bunch of Q-Tips and stealing my wife's toothbrush here is the end result:
I moved on to clean the top case with an Acrylic Liquid mix, I used all of my liquid and have to buy more tomorrow. but seems the mixture is eating up the plastic a little and it is only good for a quick clean up of the Keycaps, not the whole case.
I will focus on cleaning the mainboard and floppy on my next attempt.