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Chemical usage of cleaning buildings

I want to know about the chemical I can use to clean old sandstone buildings. I want to clean my ancestral sandstone building.

Rahul D
contractor - DELHI, INDIA
2004

Contact National Research Laboratory for Conservation of Cultural Property in Lucknow (www.nrlccp.org/english.htm)! Or you can visit www.buildingconservation.com website!

Good luck!

Goran Budija
- Cerovski vrh Croatia
2004

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