2. How to clean the stone sculpture or the stone fireplace by no harmful way?
1)To buy some water sand paper and a candle,the sand smaller the better.
2)Use the sand paper polish the stained parts,when polishing need put some water to water the stained part,a moment latter it will be cleanned and it's no harmful.
3)Wax,let the polished place being dry and clean,you lighten the candle,when one has some wax water then pouring to the place just polished,being attention it's only need a little wax water,use the fireplace near the stone,a moment latter the wax will penetrated to the stone,the stone show the real color again.