Oxalic acid (available from a good hardware store, if you still have them
where you live) is a nice safe acid that should work. It comes in crystal
form. Add about 1/4 cup to a gallon of warm water, stir to dissolve. Soak
the pebbles in a bucket if you have a few, or spray it on with a tank
sprayer if you have a lot. If spraying, spray repeatedly over the coarse of
a few hours. Then rinse with fresh water. This should clean them up pretty
well.
David

"Gideon Singer" wrote in message
...
No these were caused by an iron grid that was supporting the center
rock in my bubbler as well as preventing the river rock from falling
into the basin underneath.

On 27 Feb 2004 04:37:25 -0800, (J. Del Col)
wrote:

If the rust is caused by iron-bearing minerals in the rocks, no.

If you use various products made for removing rust stains from sinks,
etc, the
stains will reappear after the rock has been out in the weather for a
while.

J. Del Col

To email replace orchids with shaw