On Fri, 22 Oct 2004 12:24:20 -0400, "Charlie Bress"
wrote:

I was working on the car and noticed a lot of built up corrosion around the
battery terminals. No big deal, right?
I cleaned of the terminals with a wire brush, replaced the bolts and nuts
(this is a top mounted terminal battery) and then I took the hose and
rinsed of the top of the battery.

Now comes the problem. Wherever the run of went there are nice ugly brown
stains. The driveway is poured concrete and my understanding is that it is
"fiber" reinforced.

What is the best way to clean these marks off? Looking at Google for
concrete cleaning I see muriatic (hydrochloric) acid or phosphoric acid.
These tend to be nasty to work with. Is there something else that will work?
The stains look like rust, but C-L-R doesn't seem to touch it. I tried some
full strength. It might have worked a little.

I am not sure it is rust. I don't know what has been put in the concrete.
The driveway does not show rust marks where it is exposed to the weather.

the acid solutions are really the best and cheapest ways to fix it.
Mix it with water, apply and the rust comes out, gauranteed. Just wear
safety glasses. I had a landscaping company drop ironite on my
concrete and had tons of rust specs all over it. I complained to them.
They asked if I had some pool acid left over and if they could use it.
They removed it in no-time.

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