Old E30 not washed in years

[V0cnorth]

Would like a little advice please. Recently picked up a White E30, it had been left on a drive for two years.

The paints really flat and had a lot of green algae and some shotgun fungus on it. I've used a few pre washes and snowfoams. Didn't really cut it.
I had some TFR but was reluctant to use it.

I've dug the sponge out and given it a good clean with a strong shampoo, it's lifted 99% of contaminants off but it's left microscopic bits on the paint leaving it very rough to the touch. I've had a read and some of the orange spots are possibly rail dust/fallout. But there's also black and brown spots.

I'm a bit reluctant to get a polisher/cutting compound on it as it really feels like these bits need to come off first, they feel embedded. Any ideas on a system/method of ridding them before I take the oxidation off with a light cut/polish.

Thanks in advance.

[Kellerman]

You want a clay bar. It'll pick most of that stuff off no problem.

[Chainsaw Rebuild]

Once you have washed it, you want to use automotive clay. I use bilt hamberbut there are lots of options.

[Prohibiting]

Iron fallout remover then a clay bar or clay mitt.

Show us the results after!

[somouk]

How old are we talking before you get going?

Old paint and being white it could be single stage and not a laquered paint so be careful with it. Any pictures?

[V0cnorth]

[V0cnorth]

Clean patch on bonnet was there already. She was in a bit of a state.
The green is gone with a couple of good washes.