I saw a post about OCD here. You think you guys obsess over chips? You're debating two or three cleaning products and processes. Go to a firearm forum and search "gun cleaning" or "gun oil". You're computer is likely to implode. The discussions on the chemical breakdowns, tolerance for temperatures (that none of those guys will ever be exposed to), and on and on. Gun oil? MOBIL1, problem solved and cheaper by the gallon than anything else those guys are using.
One thing about TSP, it also gets off nicotine. Dawn probably won't do that. That said, the recent casino chips probably don't have much nicotine, unless they are from a private seller who smoked. Greased Lightning is another great cleaner. Some of these cleaners, like Spray Nine will kill HIV, so if that cleanliness is important to you, Dawn won't get that done either. I think Greased Lightning is similar to Spray Nine. I know it's never harmed any items that I've cleaned with it and it works well.