What to use to clean years of mold off the paint

[BigRandy]

So my 74 has been neglected for what looks like decades. The paint is shot and it looks like the clear coat is coming off.

I'm not too worried about being delicate with a good wash. There's black mold or tree spots on the cab. What can I use to scrub it down to the paint. Dish soap? Tied powder if they still sell it? I've even considered Comet in a can and rubbing it off.

It used to be white but now it's mostly a yellow off-white.

What do you guys and gals use when you bring home a rusty, faded old truck?

Thanks