I bought a house that has a kitchen sink that has never been caulke around the frame that sits on the counter. I have sprayed Clorox water, scraped, sprayed and scraped several times. I am concerned about mold and/or germs growing under the lip of the sink. Do you think it is safe to now caulk it with silicone caulk. Again, it has never been caulked, but I jsut don't know how much I am supposed to clean it before it is safe to caulk it.