Removing existing water slidedecals from a tinplate passenger car

Has anyone tried to remove an existing waterslide decal from a tinplate passenger car .   Specifically I would like to remove a MTH Lines decal and replace it with a Lionel Lines decal.   The Lionel Lines decals are readily available to buy .    In the late 1990s MTH placed their name on the side of standard gauge passenger cars ,  instead of Lionel Lines .       If this is not a good idea to try , let me know. !       I own 15 or so MTH engines, so I do like their O and standard gauge lines a lot.