Replies

1. 
   parrothead | Aug 15, 2003 04:47pm | #1

   You could try some bleach, it works on wood.  There are two types of bleach used for wood, household bleach like chlorox and Oxalic acid (this would be labeled as "wood bleach" and can be found at a hardware or paint store, Dap has a product called wood bleach. They can be used alone or as a mixture together.

   Good Luck

   Mike

   We are the people our parents warned us about. J. Buffett
1. 
   BillHartmann | Aug 15, 2003 05:04pm | #2

   " They can be used alone or as a mixture together."

   ABSOLUTLEY NEVER DO THIS!!

   You can generate phosgene gas and possible explosions with strong chemicals. I would not want to breath or take a shower in any of them.

   You can so them one after the other (after rinsing), but not combined.

   Actually there are 3 types of "beach" used on wood.

   Chlorox and it is good for removing dyes.

   Two part wood bleach and that is good for removing the natural color from wood.

   And oxcalic acid. That is good for removing water and iron stains from wood.

   BTW, Oxalic acid is often what is used in deck cleaners and brightners.

   But I would start with a paint stripper because a stain is pignments and/or dyes combined with resings to hold them in place.

   Then you can try the cholox followed by the oxcalic acid and then maybe by powerwashing. But I suspect that much of the pigments will stay "stuck" in the crevices of the sandstone.

2. 
   SamT | Aug 15, 2003 10:57pm | #4

   Stain 'em all.

   SamT

   True, the white man brought great change. But the varied fruits of his civilization, though highly colored and inviting, are sickening and deadening. And if it be the part of civilization to maim, rob, and thwart, then what is progress?

   I am going to venture that the man who sat on the ground in his tipi meditating on life and its meaning, accepting the kinship of all creatures, and acknowledging unity with the universe of things, was infusing into his being the true essence of civilization....

   Chief Luther Standing Bear, 1933,              From the Land of the Spotted Eagle, p.515

2. 
   IMERC | Aug 15, 2003 09:40pm | #3

   Turn the pavers over.

1. 
   Luka | Aug 16, 2003 05:07am | #6

   Dangit, you beat me to it.

   Other solutions... replace the stones that got stained. Or... "spill" the stain on all of them.

   A good heart embiggins even the smallest person.

   Quittin' Time

3. 
   coonass | Aug 15, 2003 11:30pm | #5

   J,

   We've done acetone and a poultice. Here is more info.

   http://216.239.39.104/search?q=cache:E9-T_tFBd_wJ:www.asianscholarship.org/publications/papers/Stephen%2520Chia-The%2520Study%2520on%2520the%2520Cleaning%2520Methods%2520of%2520Stone%2520Artifacts.doc+stained+sandstone+removing&hl=en&ie=UTF-8

   KK

4. 
   nigelUsa | Aug 16, 2003 05:38am | #7

   flip them over if you can or get new. like you said "stained"