Admittedly some machines did leave the factory decorated in the stuff, but sadly over the years I have walked away sobbing from machines for sale that shouldn't have come within 100 miles of the stuff.
Apart from being damn near permanent it hides a host of evils, and if not painted carefully can leave impenetrable runs and brush drag marks.
My excuse for having discovered the following tip is that I was painting the steel hatch on my canal boat
However Hammerite Brush Cleaner is £100 a litre, if you buy it cheap on eBay.
So over the years I've bought throw away paint brushes used them once and chucked them, as they go hard as rock within a short time.
This weekend I happened to have some Nitromors to hand, so as I had finished for the day and was planning to do some more the next day I plonked a small splodge of Nitromors on the bristles then wrapped it in cling film.
24 hours later I was surprised to find the bristles were still bendy. Using a a piece of kitchen paper I blobbed a bit of White Spirit and wiped the paint brush clean.
Good enough for me, but I guess that mixing unknown chemicals (especially nasty ones) together isn't to be recommended so be careful.
Probably best to let the children do it until you know the risks to yourself.