Short solution for short problems

How to hide or show space, tab indicators in visual studio

I accidentely pressed a wrong key combination in VS. then the space and tab indication showed up.

I tried looking in the options of the text editor and all environment options but couldn't find the solution. Then I googled and came up with the key combination that does the trick. First press Ctrl-R then press Ctrl-W. You will see the indication go on and off.