Heavy Duty dirty

[Darkoverlift]

Need opinions on cleaning a white paint that has not been washed in months and has mold and tree filth on it.
Will a dawn was before clay and polish be best or is there a product that really cleans dirty neglected paint I am not aware of?

Just looking for ideas or alternate options.

[Eldorado2k]

I’d start by spraying an iron remover [IronX, 3D BDX, or McKee’s Iron Remover] on the dry paint in the shade, and once it’s done taking effect [about 5min] begin washing normally. You could either add a couple ounces of APC concentrate to the car wash suds or use Dawn like you said.

What kind of clay are you planning in using?