Dark side... sheesh.
Lose your first gecko to parasites and you'll appreciate the sanitation ability of fake plants. Just giving you a hard time. 
Go buy the smallest bottle of bleach you can find and follow the directions, it is something like 1 Tbs to a gallon of water. We always use too much and you can really fumigate yourself if you do that, I don't suggest that.
We mix in a small squirt (pun not intended) bottle, go outside or the bathtub spray everything down and then rinse, rinse, rinse, rinse. If you are doing an enclosure too, just fill the enclosure with the mixture and swish everything inside that. (We also keep a bucket for this sort of thing.) The most important thing is to rinse more than you think you need to and dry. (There are commercial reptile sanitizers, but they're just as bad as bleach and have the same warnings like "don't put plants in until fumes are gone".) This is easiest if you have a driveway, or borrow someone's, and use a hose, really and sun dry. Check to make sure nothing smells like bleach when you are done.
Umm... All my plants have huge bases, could you do something like nontoxic glue paper mache over Styrofoam or maybe make an air dried clay base? I don't know, I'm out of my element here.
The water goes where it always goes, not many real plants absorb water through their leaves, so you'll get droplets and little pools on the fake leaves and the rest will go into the substrate just like before.
Have fun!
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0.1 Albino Leo Gecko
0.1 Crested Gecko
1.0 Dear Boyfriend
Departed: Harvey and Spock