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I've been using Bare Minerals foundation and other facial makeup for just over a year now and have been very impressed with how nice it makes my skin looks. The fact that it is mineral makeup means that, unlike liquid foundation, it is actually good for your skin and you can even sleep in it without it clogging up your pores and making you look like you've pissed off the acne fairy. My skin has never been particularly problematic but I do get the odd spot or bunch of white heads and so I try to keep my skin as clean as possible. I use cleanser and toner once a day and a face wipe in the evening but there was still the odd spot that just wouldn't go away. It then occurred to me that even though my skin was clean and my makeup was supposedly good for it, I kept prodding at my face with the same two brushes every day. When I thought about how filthy my concealer brush especially must be, since it touches any spots I have directly when I'm trying to cover them up, I decided that I had to start washing both brushes much more often or my skin wouldn't stay nice for long. I therefore decided that Bare Minerals' own 'Well-Cared for Brush Conditioning Shampoo' would be a good purchase as it would keep my makeup brushes nice and clean.
The shampoo comes in a small simple yet nice looking white bottle which holds 120ml of the product. The back of it gives the directions for use as well as the ingredients though in general how to use this shampoo is fairly self explanatory. What is recommended (and what I do) is to wet the brush, squeeze a small amount from the bottle directly onto the hairs of the brush and then massage the shampoo into the hairs and rinse under running water. It says to apply a 'dime sized' amount of shampoo, but since I'm not familiar with American currency and its size, I just use a small blob at a time until the water runs clean.
I have to say that the first few times that I used this shampoo I was quite appalled with myself for how bad I'd allowed my brushes to get. I kept forgetting to wash my foundation and concealer brushes and so a couple of months would often pass between washes. When I lathered up the shampoo and rubbed the brush around in my palm I was disgusted by the orangey coloured foam that came out of it. The thought that all of that old foundation was just sitting in my brush and touching my face every day was not a particularly pleasant one. I lathered, rinsed and repeated until the water running through the brush came out basically clean and then, as directed, smoothed the hairs back into a brush shaped formation and left to dry on top of my chest of drawers. I use the same technique for my concealer brush, but as it is smaller, it takes quite a bit less time than the larger brush does.
After being quite bad at remembering to shampoo my brushes regularly I now try to do it at least a couple of times a month in order to keep them in a reasonable condition. Now when I do it I only have to repeat the process once before the brushes are acceptably clean. The only real problem with washing brushes often is that it does take quite a while for the larger one to dry, and so I have to make sure to do it the day before I want to use it to apply makeup again. This is usually not a problem as there's always at least one day a week that I don't go anywhere that requires wearing makeup but it does mean that I have to plan ahead somewhat. The shampoo states that you have to make sure that your brushes are completely dry before using them again and so I like to give them as long as possible to lose all their dampness.
In conclusion, this shampoo is excellent for cleaning my brushes and giving me peace of mind that my brushes aren't doubling as bacteria farms. Bare Minerals also do a spray that is meant to quickly refresh brushes, and although I haven't tried it, accompanied with occasional use of this shampoo your brushes will stay clean and in good condition for quite a long time. Although I use this with the brushes of the same make, I am sure that you could use Bare Escentuals shampoo with brushes from any other brand and I would highly recommend it to anyone who uses makeup brushes. At £6.80 for 120ml it sounds fairly expensive, but since I've been using it for just under a year and there is still most of it left it is really worth the investment.