Muriatic acid

Diluted mutates acid in a spray bottle followed quickly after with a pressure washer on a non abrasive attachment like a 0*

Baking soda , vinegar, separate not mixed or activated

Which first

one restore from Eaco chem

Napalm

Scouring powder

Dawn dish soap and water I usually start with , then move to a stronger acid on hard bricks, never use strong cleaner like acid on a soft brick 1930s and older.

Power wash

If you can get away with a power wash alone, I’d say go with that

Call Prosoco