help with RV stain

[KenA]

Hi Guys,

I'm not a detailer, but, I do use creams, compounds, solutions and have orbital buffers etc. Using all of these tools, I through every cleaning solution, cream and compounds I have at this problem, to no joy. I'm thinking somewhere in my past cleaning, I left a cleaner or sealant on without a thorough rinse.
Am hoping someone here has a "solution" Pun intended. Thanks for any advice.