I belong to the school of thought that believes in washing everything (including the occasional cat) with warm water and detergents, but sometimes you need a quick and efficient shortcut. When it comes to my makeup brushes, especially when traveling I don't always have the option or time to do the whole washing and careful drying routine. Not to mention sometimes you need to clean a brush right in the middle of makeup application and re-use it immediately. That's what cleansing sprays are for.
I've been using Youngblood Pro Brush Cleaner for several weeks now, at home and away and I'm highly impressed with its performance. Just like with other quick brush cleansers, you just spray and wipe until dry, so there's no inventing the wheel here. It's just that Youngblood's cleaner is very effective and removes every last bit of color and gunk from the brushes, requires less effort than the equivalent Sephora product and dries quickly (once I learned there's no need to saturate the brushes with solution, that is), so I can reuse the brush right away.
Bottom Line: My current favorite.
Youngblood Mineral Cosmetics Pro Brush Cleaner ($18) is available from ybskin.com. A press sample was sent from the company for my consideration.