95% up to 100% Rubbing alcohol, you know the stuff you have in the "bathroom" or in your First aid kit. I know that sounds silly but one thing I have learned from building Military Models is what to use to strip off Arc-types of paint. Try that and let me know what the results are.
http://en.wikipedia.org/wiki/Rubbing_alcohol
I use this type but the label is Pink for the [95%] and Gray I think for the [100%]