Agree....a razor blade/knife will work fine. The foam will peel right off. You can clean any residual with alcohol (on the rod, not inside you) and it will be fine.
I'm almost finished refurbishing two old S-glass rods and they cleaned up nicely.
Three-fourths of the Earth's surface is water, and one-fourth is land. It is quite clear that the good Lord intended us to spend triple the amount of time fishing as taking care of the lawn.