Some of the "hard water deposit" removers on the market have some hydrofluoric acid in them. I suspect it is very little, but the bottles say there is some. The stuff is next to worthless in my opinion. I had a patio door that got sprayed lightly with water every time the lawn sprinklers came on, and after 5 years the window was permanently fogged slightly. I scrubbed with that stuff for a couple hours, and couldn't see any difference. I sprayed it on and left it for a half hour and still couldn't see a difference. So, as bad as it is, it really doesn't do much in consumer strength products.
On the other hand, that is the acid used for etching glass too.