soap scum on blue stone hearth

[Nicholl]

I just built a hearth with PA blue stone. Before I was going to seal it, I decided to clean it with Professional Choice Miracle Sealants tile and stone cleaner from Lowes. After washing with warm water and sponge 3 different times, Once dried, I continue getting these white lines around the grout that appear to be soap scum. Does anyone know how to remedy this?

 

[begreen]

Try some vinegar on a clean rag.

 

[vatmark]

Is it efflorescence? If soap scum why only on the edges?

 

[EbS-P]

If vinegar and a good nylon brush don’t work try some rubbing alcohol.