Afternoon gents. Quick question. Is there any special chemical/detergent that you use to remove car exhaust/smog from concrete buildings? Since I started pressure washing I can’t help but to point out filthy buildings while I drive now. Lol. Anyway, I’m driving down the New Jersey Turnpike and it’s nothing but concrete buildings turned black from cars and trucks and just New Jersey in general lol. So just out of curiosity, any of you guys do this removal and is there anything special to it.
