Clear variables that appear in multiple contexts?

Questions
1

How do I rid myself of these annoying messages.

area::shdw: Symbol area appears in multiple contexts {IPOPTLink,Global}; definitions in context IPOPTLink` may shadow or be shadowed by other definitions.

I have used “Clear[“Global*"]", but I still get these messages, if I run "Clear["Global"]" again then the message will not appear. If "Clear["Global`”]” works
why does it have to be used in every cell???

Sure I could use just Clear or ClearAll, but that means I have to remember every variable I have used and I just want to clear them all, but “Clear[“Global`*”]” does not work, so what would work???

For some reason this format drops letters I used Clear [ " Global ` * " ] i put in spaces so the letters and symbols would not get dropped out

2

You can try Remove, which removes the symbol from the global context. Clear only clears the values, if there are any, but the symbol itself lingers on and triggers messages.

3

Thank you Gianluca, that worked

But, like Clear[“Global*"], Remove["Global*”] worked, sometimes, only after the second time I used the command. It was as if Mathematica did not believe me the first time, something like a safety feature, and I had to re-evaluate the cell a second time before it worked, or enter Clear or Remove a second time in a new cell before it worked???