Dear Glenn: We purchased a home in Livonia in October 2009. The home was built in 1967. The home had been vacant for two years. A month later, we began noticing a moldy smell emitting from master bathroom.

It became progressively stronger as the days went on, but we cannot determine exactly where the smell is originating from. The odor has become so strong, that I can now smell it as I enter the house after work each day. It seems to be coming from the drain on the floor of the shower.

I have poured bleach down the drain and washed down the entire shower, but the smell remains. I had two plumbers come out to help us, but they all said the same thing; they have absolutely no idea where the smell is coming from.

We asked about the vent being plugged, but they said since the drains are flowing, that's not the problem. One suggested that we reseal the toilet because it is not tight to the floor, and reseal the shower grout and drain.

I am concerned that if it is a mold issue, we will be sealing in the smell and just masking the problem. We are stumped, and I cannot tolerate the smell any longer! And I don't think it is healthy for us to breathe in this smell every night.

I am ready to rip out the entire bathroom. Can you offer us any suggestions? We really need help now.

Karyl, via -mail

Dear Karyl: OK, now we need to take air samples and moisture readings. Call Sanit-Air, (888) 778-7324, www.sanit-air.com. Ask for Connie Morbach.