cleaning

Hi everyone, I have a few CPS2 games with varying degrees of dirtiness, nicotine, & coffee satins. I was wondering if anyone knows the safest way to clean shells without harming the shell. Also, the safest way to clean the PCB? is it still alcohol and a cotton swab? I've seen some folks saying...

I've been slowly disassembling and cleaning my Blast City. The inside of the front and back smell pretty strongly, and when I first left it on for about two hours, it made the room stink for a week. I'd really like to get it as clean as possible while I have it apart. So far, I've sprayed Krud...