I don't have a dryer, so how would I dry them after putting them in boiling water?

Yes, as long as your dryer has a “No Heat” or “Air Fluff” setting. Gently tumble your silk item(s) and check on them occasionally to see if they’re wrinkle-free.

Yes, because when the cake comes out the flowers will thaw and will not be dry.

Yes, it should be able to be cleaned with following the steps in this article. Follow the second part of the article about treating old stains.

Sometimes a stain can come out just by soaking or letting it fade, depending on the stain and the material. Check to see if your curtains can get wet, and...

Did you lose the large black O-ring? If the O-ring is missing, or if it's getting hard, then you will have a flood.