On my last project, my '83 Trek 970, I replaced the decals with repros. Before trying to remove the remnants of the original decals I searched online for suggestions. The one I eventually tried (sucessfully) was using my wife's hairdryer and an old plastic credit card or similar material. It took some doing but the results were good.
Bill Silverman
rsilvercat@earthlink.net
Pasadena, CA