Remove black underbody protection.

Hello together.As the title says, it’s about the black underbody protection, which is supposed to help quite well.At least I thought before I came to the MT forum and read about the wax.Hab my car with it from below last year and would like to take wax this year.How do I get the black stuff off best?Or can I leave it on it and then wax on it?Have also seen videos where it was removed with dry ice rays. ywerke would be grateful for suggestions. MFG Matze