'Invisibles', i.e. formatting characters in code editor window

Formatting characters appears in all my code editor windows-CF, CFEclipse, Java-in a light-gray color. For every TAB it prints " for every RETURN it prints \n  etc.

I must have inadvertently pressed some key combo to turn this on, but how does one turn it off?! This 'feature' is saved in preferences somewhere, so a restart does not help.

I have scoured preferences to no avail, but could not find the switch. If you know, please share.

Thanks,

Noah