Quote Originally Posted by Wulf202 View Post
pressure washer
Did not work, even with mixed chemical paste beforehand...

Quote Originally Posted by BPTactical View Post
Why would you be doing it if it is an apartment complex? Not your responsibility and I would not want the liability, especially if you are planning on using the nuclear option such as acid.
Thanks for your concern. It IS my responibility since I made the stains. I'm not worried about liability as I can control access to the area from kids, pets, etc. The apartment will not do anything until I move which is still ten months away and then, they just pressure wash it, which did not work. I have a bit of an OCD/cleanliness personality and I've been really stressed recently... so hardcore cleaning is a way to let off some of the pressure, but this stupid patio just won't work with me, HA! I think it would be awesome to smooth out the patio, acid wash it, then stain it a darker neutral color, but I don't think management would go for that! HA.

Quote Originally Posted by TRnCO View Post
Maybe try some CLR. Seems to look like it might work on something like that according to thier advertisements.
No Sir, did not work on aged stains.