After the exposure of natural stones to an artificial atmosphere of SO2 with PM of diesel and gasoline in the surface of the samples.

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Octavian G Duliu

Try different solvents (benzene, acetone, white spirt, petroleum ether), all in an ultrasound bath

Maria Borges

Thank you for the help. I've already tried some of the solvents on the list, namely acetone and petroleum ether but the results have been, so far inefficients. I'm gona try to use n - hexano. Thank you for your help.

Thanks for your suggestion Duliu. It's work very well with ultrasound bath