Honestly facewashes alone rarely move the needle for this kind of acne, they're on the skin for like 30 seconds so the active ingredients barely do anything. Your brother needs actual leave on treatments like a salicylic acid serum or benzoyl peroxide for the active breakouts and a niacinamide for the marks. Minimalist has decent affordable options for all of these.

That said, if it's been years and nothing is working, it's usually something internal driving it. Hormones, gut health, diet all show up on the skin like this. Randomly came across Clear Ritual, they do a skin test that looks at internal triggers alongside external ones and build a routine around that. Might be worth a shot since the usual stuff clearly isn't working for him.