Earlier this month, I read a review of brush soap on The Miniatures Page, for details go to this link. Later I browsed e-bay and found a UK based supplier of The Masters Brush Cleaner and ordered a pot.
I thought I would test out some of the claims for this product on three of my brushed. From left-to-right they are; Rosemary & Co Series 401 No.2 (my current go-to figure painting and working brush), Rosemary & Co Series 401 No.1 (a well used and rather forlorn brush that I have been using for drybrushing) and a Daler B12 No.8 Bristlewhite (another old brush that I use when painting terrain. This brush was originally part of my Fathers collection).
I used warm water and brush soap on all three, then repeated the exercise to see what effect the brush cleaner had. From top-to-bottom; The Rosemary & Co Series 401 No.1 has cleaned up well and I would suggest that the bristles are even a little more pointed. The Rosemary & Co Series 401 No.2 was the real beneficiary, with caked-in paint being removed and the point restored to a nearly new condition. The Daler B12 No.8 was in a well worn state and after two washes, I was surprised just how much caked-in paint came out. I can also confirm that the white bristled are much cleaner.
In the past I have used standard washing-up liquid, shampoo (and conditioner) as well as Imperial Leather lanolin soap to clean my brushes. I'm not saying that The Masters Brush Cleaner and Preservative is that much better than the 'standard' soaps, but on first look I have been impressed and I would recommend the brush cleaner to other figure painters.
I hope that this practical post is of interest and helps.