Okay, you may think this is strange, but...I have mostly fresh plants in my living room. But also, I have a swag of artificial greens over my swag valance in my large window and a couple of very attractive grren artificial plants in very nice pots that are so very real looking. Plus in my bedrooms I have silks flowers in vases. Also in each bathroom. And yes, do they ever get dusty. That drives me nuts.
Now, this is what I do every 6 months. I fill the tub with very warm water only about 2-4 inches deep. Add 2 cap fulls of Downy, mix it well. Have all your loose flowers and your plant on the bathroom floor. Cover your floor with a large heavy towel. With the loose silk flowers, take as many as you can hold in your hand, by the stems, and swish them gently in the warm water, not briskly. only for about 15 seconds. Lye them on the towel to dry. The ones that are in a pot, if they can be pulled out of the pot, do so. If not, just turn the pot upside down, and swish the leaves or flowers around in the warm water for about 30 seconds. Then keep them upside down on the towel to dry. This works very well, and they dry with a clean fresh smell that stays with them. Try it with one or two stems and you will love it.