Hi! can anybody tell me how can i remove screen printing from a calculator without damaging the surface?

I would also like to know if can remove screen printing from memory card(flash memory chip which is inserted in mobile fones to increase memory); without damaginf the screen.

Can anyone tell me if I can use print shop 2.0 fonts for commercial use?

I need some fonts for my cards. I have print shop 2.0 and before i go buy fonts can anyone tell me if I can use those for commercial use. I searched their help section but found nothing about the use of fonts.