Incognito / private mode kind of solves this, but form autocompletes, and browser history when I enter a URL doesn't always contain stuff I want to show in front of my clients.
If you're using Chrome (and I believe Firefox can do this too), if you go to the settings, there is a section for Users. You can add a new user to the browser and use that account for demo purposes. Our sales guys do the exact same thing.
Incognito / private mode kind of solves this, but form autocompletes, and browser history when I enter a URL doesn't always contain stuff I want to show in front of my clients.