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Q: Rust stains in concrete driveway ( Answered,   1 Comment )
Subject: Rust stains in concrete driveway
Category: Family and Home > Home
Asked by: mpkearns-ga
List Price: $30.00
Posted: 23 Sep 2003 20:28 PDT
Expires: 23 Oct 2003 20:28 PDT
Question ID: 259611
How do I remove rust stains from a concrete driveway? My old truck
wintered in the driveway of our 10-year-old home, and rust spots
formed beneath it in many places on the concrete driveway in the
course of a long Minnesota winter.

I have started the job with Behr 991 - "Concrete Etcher & Rust
Remover" - recc'ed by Home Depot, but it leaves big streaks of lighter
colored driveway - also cosmetically bad - and when I rinse, it
bleaches out the concrete gutter in the street all down the block! I
tried it full strength.

Behr customer service suggested that I follow up with 1/2 cup baking
soda in a gallon of water, and over time the appearance will equalize.
Can I trust this?

Is there a better technique and/or product for my drive, and the
neighborhood's gutter? Better fix for the bleaching of the 991?
Subject: Re: Rust stains in concrete driveway
Answered By: journalist-ga on 23 Sep 2003 21:49 PDT
Greetings Mpkearns:

A short article at
titled "Concrete-Characteristics and Cleaning" suggests "a hot
of 2 to 2 1/2 ounces washing soda or 1/2 ounce trisodium phosphate
(for example Spic and Span) per gallon of water."

I then searched for "washing soda" and located this information at :

"Washing soda--sodium carbonate--is in the same family as baking soda.
It has just been processed differently. It is much more
caustic/alkaline, with a pH of 11, and while it doesn't give off
harmful fumes, you do need to wear gloves. It is found in the laundry
section of most supermarkets. Arm & Hammer is one brand; Shop and Save
has a generic house brand."

It may be that your friend meant washing soda instead of baking soda. 
The recommendations there include a suggested solution for cleaning. 
Also, at the site at it is
suggested for rust "Apply a hot solution of 2 to 2 1/2 ounces washing
soda or 1/2 ounce TSP (tri-sodium phosphate) per gallon of water. TSP
can be found in paint, hardware and home center stores."


I also located a few other methods and products for your

On a thread at Bob Vila's website, the following methods are

** SAFE n' EASY Rust Remover by Dumond Chemicals
** naval jelly and a steel brush
** "Naval Jelly, or anything that has Oxycilic Acid in it. A few
products you can get at the store are ZUD (Z-U-D), and Barkeeper's

You may view the thread at


From an article at the Washington Post at
lists Oxalic acid, Rust Spotter, Trisodium phosphate (TSP) and suggest
trying a plumber's compound called Iron Out.


At it is
recommended to use Barkeeper's Friend.


The website at recommends
(for iron rust):

** Iron rust, light - Oxalic acid, ammonium bifluoride; 10 per cent
muriatic acid; phosphoric acid
** Iron rust, deep - Poultice of whiting, sodium or ammonium citrate
and glycerine; poultice of sodium hydrosulphite and fuller's earth.


A product for removing rust called "Polly's 1" is for sale at


Regarding references to baking soda, muriatic acid is recommended to
clean tile and masonry at - The site also
suggests using a product called Grout Bright and then sealing the
concrete afterwards.


This is from

"Another excellent product for the removal of concrete rust stains is
Whink Rust & Iron Stain Remover, a multipurpose powder that routs rust
from almost any surface except marble. It is recommended for concrete,
stone and brick surfaces and is marketed by Whink Products Co., P.O.
Box 230, Eldora, IA 50627; phone (800) 247-5102."


If you require any clarification of the links or information I have
presented, please request it before rating and closing your question
and I will be happy to respond.

Best regards,


removing rust stains from concrete
"removing rust stains" concrete baking soda
"rust stains" concrete baking soda
"washing soda"
"washing soda" concrete rust stains
Subject: Re: Rust stains in concrete driveway
From: pinkfreud-ga on 23 Sep 2003 22:28 PDT
We had some stains on our concrete patio. What worked was a product
called "Zep Driveway, Concrete & Masonry Cleaner." Repeated
applications using very hot water, then rinsing with a
pressure-washer, did the trick.

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