At 17 pence for two litres a bargain for cleaning brass. When you see the sparkling results after 30 minutes' immersion you certainly wouldn't drink it!
My OH used to work in a cola canning and bottling plant. He says that if you saw what it did to the machinery you would never drink it again! He did find another good use for it though. On one occasion an electrical fault caused a small fire under a machine he was fixing and not having an extinguisher close at hand he grabbed a can off the conveyer shook it and opened it and used the foam to put out the fire!