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you can soak them in bleach water, they will shrink up, but as they dry they open up again. I soaked them before when i made wreaths for the chruch. Its easier to put them on the wreath rings.
I would soak them in soapy water with a small amount of bleach. Rinse thoroughly, then let them dry thoroughly and brush on some Mod Podge. This acts as a sealant and gives the cones some luster and enhances the color of the cone. You can find Mod Podge in any craft store.
I would choose the high gloss but there is a mat one also. When first brushed on, it will appear milky but dries clear. Click below to check out what Mod Podge is.