Hello, Looking at purchasing 2024 22SXSB. Dealer suggested Vantage toon protection and fabric / side panels protection for ~$3k. I understand the toon protection but not familiar with protection sprayed on panels and interior. Salesperson thought panel protection would help with hard water spots in smooth matte black exterior. Does anybody have any thoughts regarding if it is worth it for the panel and interior protection or if I could do something myself?