concrete driveways

[desi 14]

Hello,

I use sodium hydroxide to remove oil and other stains from concrete / asphalt driveways /walkways. Yesterday I was doing a concrete driveway with iron stains from the fertilizer, I could not get them out. What should I add to my chemical list to remove stains like these. I try to keep my chemical inventory simple. yet effective.

thanks in advance

[MMI Enterprises 289]

Oxalic acid I suspect would work

[schrec 64]

oxalic will work been there done that

used it on sidewalks and curbs at one community

and brightens them too

[David O'Connell Jr. 14]

oxalic doesn't always work, go to lesco's or your local lawn maintenance supply house. they sell chems for fertilizer removal.