Artificial flowers do require some maintenance: It’s best if they’re regularly dusted or vacuumed with a brush attachment. Some of them can even undergo a washing in the sink, or outdoors with a hose if they’re big plants. For the more delicate arrangements, there are many other ways to clean, which depend on the material. If they are waxed fabric or latex flowers, it may be best to lightly spray them with flower cleaning spray or just water and vinegar, then wipe them down. Some silk flowers can also handle the water-vinegar spray, though you should spot-check before spraying down a whole artificial silk arrangement. A tried-and-true quick-fix for cleaning delicate artificial flowers involves putting a half-cup to 1 cup of coarse salt into a plastic bag with the flowers and shaking for one minute.