Triacid works better.

They have different effects. Phosphoric acid and sulfuric acid react on the surface, while nitric acid produces passivation, which slows down the corrosion rate. Phosphoric acid forms a viscous diffusion layer containing aluminum salt on the surface, which increases the thickness of the sag and protects the sag.

You can use diacid, phosphosulfuric acid and phosphonitric acid.

If only sulfuric acid or nitric acid is used to make the surface bright, the effect is limited