I used half a packet in first the sink and half a packet in the tub/shower. I poured in the product and waited half an hour, poured hot water in the sink, and went to get hot water for the tub. You would not believe the tub, it was brown; the bottom of the tub and up the sides to the overflow line. I've tried everything. The best results are Foaming Bubbles foaming bleach and scrubbing.
I've spent 3 days trying to remove this stain. I believe that it is acid-etched as the tub was porous. I also believe that it had to be a gas to cover that much territory. I tried to call the only telephone number I could find, and no one answers.
Bottom Line: No, I would not recommend this to a friend
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