I have a 4000 psi 4gpm machine. The framers spilled there red chalk in the garage.
I used the pool bleach from Walmart and a 15 degree tip. The chalk did not break at all. Any chemical recommendations? I do not have heat available on my machine
I have used clr full strength and had pretty good success
3 Likes
Chalk is not organic so no surprise it didn’t phase it.
Your surface cleaner didn’t get it?
Sir, I appreciate you very much. CLR did the trick!
2 Likes
No sir, the red dye in the red construction chalk (used for pop lines) stains concrete is so porous it dives right on in.
Glad you got it cleaned up 
