gray "dust" on plastic plants

[newatthis]

We just cleaned our tank completely out 2weeks ago. Now our plastic ornamental plants all have a gray dust on the surfaces. I don't know if it could be algae or what. I'm just concerned if it is something I need to fix or just let it be.

[Full3R]

i reccomend u do another water change and then put all ornaments and plastic plants in hot water for about 20 minutes to kill whatever was growing on them...