Yes daylily rust spores can be carried in on the wind but the further away the nearest infected daylilies are the less likely that is to happen. Rose rust does not affect daylilies, there are thousands of different plant rust fungi and each typically has a limited number of host plants. Daylily rust only affects daylilies and Patrinia, and no other rust infects daylilies.
Being picky, bleach is also a chemical
The problem is that if a plant is already infected with daylily rust then the fungus is growing inside the leaf, so bleaching the outside of the plant will not kill it although it may deactivate any external spores it contacts. There can be spores lurking between the leaves that will not be reached by a contact dip. The more effective dip would be a systemic fungicide if there is something available there that is labeled appropriately but some of those work better than others.
Just so that I understand, are the plants you were thinking of treating with bleach plants you already have rather than new plants from someone else?