Thank you for reaching out with your materials question.
Here is some basic information about this material and finish:
Matte Gold, Polished Gold, and Polished Nickel Steel go through an electroplating process that deposits a 0.1 micron layer on the outside of the product. This gives them a unique finish and is great for aesthetic purposes, but will wear off on functional products that are exposed to friction.
Showering with the model would most likely cause some oxidation/rusting.
I hope this helps, but please let me know if you have any other questions about this.