The Masters soap is very good, lots of lanolin to condition the fibers. I use it after every session.
W&N have a brush cleaning fluid - wicked evil stuff. Do not let anything more than the brush fibers in it. It will eat the laquer paint off the handle and will tarnish the chrimed furrel. I use a small paper binder clip to hold a brush just to the furrel touches. Let it soak for a couple of hours and then to a regular brush soap cleaning and be amazed at the stuff that comes out of up in the furrel.
Yes, lots of it gets up in there by capillary action, but some of it gets up there by standing wet brush up on their butts, letting moisture and trace bits of paint get up into the furrel.
***
cleaning:
a half quart container would be about the smallest amount of cleaning water I\'d use. I like empty cake frosting tubs. Put a few drops of dish soap in the water.
Swish brush in the water. DO NOT stab the bottom of the water tub with the brush, this will damage the bristles. Instead roll the brush against the side of the tub. Swish some more.
Pull across a paper towel. If lots of color comes out, repeat. (I like the blue shop towel rolls - less lint than regular paper towels).
Final rinse in second tub of clean water.
(some people have a separate primary tub for metal.)
***
End of session
Clean brush as above, but do not dry on towel. Instead swirl brush across The Masters soap. Side to side putting a little pressure on the bristles like you are trying to pick up that last bit of paint on your pallet.
Now, take your brush to your palm and swirl it around until you have a nice later from the soapy brush. Again putting slight pressure on the bristles so as to work the soap up into the furrel.
Now go back and rinse in the clean water and pull across your towel.
Lots of color? Repeat the soaping.
Clean? Make sure the tip is nice and leave horizontal to dry.
TIP:
if the brush tip does not want to stay nice, get a bit more soap - not a lot just a bit. Form the tip and let dry as above with the soap setting the bristles.
If the tip still does not want to stay formed, go for a soak in the W&N Brush Cleaning Fluid.
Still no good? you now have a new drybrushing brush.
I\'ve managed to keep several W&N S7\'s for several years with this method.