My roommate has an old mortar made from stone that had been outdoors for quite some time. She rinsed it thoroughly,put it in a big pot, and boiled it to kill any bacteria that could be crawling in there. 

The mortar has great sentimental value for her, and I'm unsure about what products use for cleaning, if at all, since the stone might absorb the chemicals and render it unusable. 

This related question seems to indicate that soap is not to be used with porous materials, such as stone. 
[Why are stone ware and dutch oven items exempt from bacteria?](https://cooking.stackexchange.com/questions/21104/why-are-stone-ware-and-dutch-oven-items-exempt-from-bacteria)

Before using it for food preparation, **is there anything else we should do** to avoid health issues? Can we use it already after boiling it?