Tile Glue Smell in New Shower

My husband installed a tile shower in my bathroom in mid September of 2011, and I can still smell the tile adhesive he used. He's a contractor and he used premixed tile adhesive. He didn't realize it would continue to put off a chemical odor after four months (he himself could hardly smell the chemicals and I wasn't there when he was getting ready to use the glue). I smell the adhesive smell through the grout lines and I don't know what to do.