This isn't about cleaning them but just in general. Last fall I decided that since it was almost impossible for me to get out and water hanging plants, I'd hang a pot of silk flowers.....just stuck them in a hanging pot in which the plants had died. Believe it or not, they've lasted through all this winter storms and still look reasonably good! and it's been so nice to have some color I can see out my window by the desk. Will get more this spring!
And thanks for all the great info about cleaning them for inside!!