How do I get "washable" paint out of clothes

[Crunchymum]

DC came home covered in it, they didn't use an apron due to heat (fair enough)

40c white wash with stain remover didn't work?

What else can I try?

Elbow grease spray or stain remover bar?
Dampen the stain, spray or rub the elbow grease and put it in a wash.
Also dry it outside. The sun brings up most stains

Try hand washing in cold water first. Hot water seems to just set the stain.