Not sure. They weren't really that dirty. I soaked them for 10 mins in Dawn Platinum 4X and warm water then wiped dry with a micro fiber towel. They look brand new now. Did more last night.
Where did you get them? Awesome score. Been looking for 100-200 solid RHC for over a year. Never seen more then one color of each for sale at one time. You are poker chip GOD!