Tried to remove a radiator for flushing, but the nuts attaching it to the
valves are encrusted in several layers of paint.

Chipped some off but wouldn't budge (not without it breaking something).
(And I think I turned them the right way..)

Any ideas on how to free them up? Almost resigned to just replacing the
radiator and the valves as well, but I don't want the bother of draining
down the system.

--
Bartc