Meet my new friend

Russ introduced me to this stuff - 3M surface cleaner.

It's almost pure alcohol apparently but its wargames use is limited to being one of the best brush cleaning products around.

Put some on a cloth, wipe over the brush and - voila!  Lovely clean brush with all paint removed.

I've managed to resurrect some old clogged brushes using this stuff - with the benefit of an overnight soak.

Not cheap (£8 each) and available only from trade suppliers but should last for ages.