i used paint remover at my gate. after the paint slightly loose, jus use 100bar pressure washer to remove it. but not all paint that can be removed with jus 100bar. some paint even after paint remover applied, hard to to be removed. maybe too thick. so reapply paint remover. for the wall, due to old owner using water based paint, no paint remover needed and directly can remove d paint.

100bar karcher 2.05 model inm. doing the job. i think maybe u jus need 120-140 bar pressure washer.