Red Clay Stain Removal?????

[WILLIAM STOTT]

CAN SOMEONE TELL ME WHAT TO POSSIBLY USE TO TAKE RED CLAY STAINS OUT OF CONCRETE DRIVEWAYS & SIDEWALKS? TRIED LANDA WATER JET & TURBO NOZZLE, SOME CAME OUT BUT IT IS STILL NOTICABLE. THINKING THERE MAY BE A CHEMICAL TO PUT ON IT FIRST?

 

[Larry Ray Staton]

Have you tried Muriatic (hydrofloric sp?) acid? It's good for rust stains. This stuff is dirt cheap, but be careful!!