Since I claim, half heartedly (or is that half-arsedly?) to be a research gardener, I'm trying a small experiment: I've chopped the (totally rust-infested) leaves off about 1/3 of the plants. Of course they've immediately started pushing out new leaves, but I'm hoping that they won't get affected as quickly as when they have an existing load of orange-brown leaves.
Time will tell; I'm even contemplating trialling a Summer planting of Garlic (something I've never done before) as a Path To Recovery.
Life without Garlic is just unthinkable!