I keep returning and buying this product, over and over.
Over the course of the years, it has proven to be invaluable in my job. As a makeup artist, and unless I have a number of same brushes that I can use, I often need to clean and re-use the same brush (for example when I want to apply another shade of colour), and this is the product at hand that I cannot do without.
It is a very fine, dry oil. Imperceptible on your fingers, and with a pretty dry consistency which allows for the thorough cleansing of your brush without having to wait for the brush to dry. before you can use it again.
I usually use one drop on a very fine tissue and very lightly cleanse the tip of the brush in a quick coating motion. The result is a very clean brush which is ready for use in seconds. It is a very economical product as well, as one or two drops are all you need, and the product virtually lasts over a year of continuous use. 
It is the perfect product if you don't need to sanitise your brushes properly, and it is always in my makeup bag!

I have a big Japanese brush collection that I need to gently clean and wash regularly. This cleanser isn’t oily or drying, it removes bright shadows and blushes in a moment, plus it’s easy to use. Highly recommend it