Limestone problem Adam 14 May 2012 11:31 EDT

Hi guys.
Few weeks ago we refinished limestone shower floor. It came out very nice. We sealed with stone tech bullet proof sealer. Customer was happy. We got paid etc. seamed to be another easy job until 3 weeks ago when customer called back with staining problem around the drain and grout lines. It looked like it was a moisture from the under neat the stone. We tried to dry the shower for now almost 3 weeks and there was no significant change.  I honed the surface to open up pores but that didnt help.  Customer doesn't understand that water is under neat of it and when I evaluated the shower floor it had so much soap scum and body oils that I didn't see the discoloration.
What can I do to fix it?
I will attach picture to the next email.

Adam Bartos
BiO Tile & Grout Restoration
773-575-5515 (c)
847-438-0212 (o)