As Focus2000 says BRAKE FLUID does a good job!!
Just make sure you give your hands a good wash after as it removes all the natural oil from your skin!!
One word of warning tho...If you have sensitive skin or have a skin complaint (i.e eczema) then wear gloves as it'll really aggrevate these conditions!
And before repainting the body give it a good scrub with some warm soapy water, to remove all last remains of the fluid else your new paintjob will end up ruined!!