I have tons of these and they always seem to need cleaning. I have done the fill the tub with water and let soak and that has worked on some.

I have heard of were you put the in a bag with salt?, but I haven't given it a try.

Does anybody have a method that works for their art. flowers?

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I don't have any artifical flowers, but my MIL swears by the paper bag with salt (or rice) in it.