Hi J.! We haven't done the silly putty thing but gum, stickers being washed on clothing, etc. I use straight basic H2 concentrate from Shaklee. Totally non toxic (I thought you would be interested in that since I see you are an advocate for children's health) and works great. Wonderful for gum in hair if that ever happens too. If you don't already use this products I could send you a sample of the H that would be enough to get it out...I think...as I said I have never actually used it on silly putty that I recall but on many other sticky things. Yes I do sell Shaklee as I have used it for almost 25 years and love it so much I decided to earn something form telling everyone about it. Just let me know if you want me to stick it in the mail and I will send it out on Mon. if you do.