Latex paint removal, a lot of it

[DanDB64]

My uncle just picked up a van that he intends on selling. Instead of removing the decals, they painted over them with Latex paint, which I need to now somehow remove... I've never had to remove so much, I used Goof off, which worked, but it is going to take a very long time using that. Not sure if you could point me in the right direction into getting this stuff off. We are removing the decals with a heat gun, which is working well, but now i have to deal with the paint... Attached are pictures of what I'm dealing with, any help is appreciated

I plan on polishing the paint afterwards too, so as long as I don't strip the clear, I'll use whatever method really

 

[MDX Detailing]

Wow. on interiors I've used rubbing alcohol to clean latex paint spills with incredible results.

 

[JK71]

Methylated spirits will break down water based paints. Might be called "white" spirits over there? I'm in oz.

 

[Crispy2001]

Try winter window washer fluid. Something in it eats latex paint and it won't hurt the regular paint.

 

[Matt@Revive]

i've used rubbing alcohol in interiors as well.