(Yes, it’s been a while.)
I have been using brush cleaner for a while now. The stuff is quite excellent, and has managed to restore brushes I would have thought were only good for the bin. As the contents of my tub were getting low, I looked for a replacement, and found something quite interesting.
To the left is my old 75g tub (typical price on Amazon and other sites: £11). To the right is the new one, all 717.1 grams of it. Amazon price including P&P: £25. I’d say I’ll never have to buy brush cleaner again, and that tub will end up in the inheritance.