What should I use to clean flagstone in our entry?
We have a small area of flagstone floor (sandstone?) in our entry that needs thorough cleaning and sealing. It appears that it was never sealed; if it was its long gone. Its in good condition but dingy with a few small stains...paint drips and some oily looking spots. Can someone recommend a good stone cleaning product for interior use? Can I use TSP on stone? I'm afraid that using solvent on the stains would carry them deeper into the pores in the stone.