Those who have a lightspray shoe (either cloudmonster or cloudboom), how easy is it to clean?

I have the alphafly 3s and no matter how much i try to keep it clean and just do normal stuff, the toe box and eventually all around the shoe just gets yellowed or darkened overall. Even after professional cleaning its still noticably there but looks mostly decent enough, but just doesnt look clean still.

How is your experience with the lightspray shoes? My hope is that because its made of a plasticy material, it wont allow dirt and stuff to stain in and stimply could just be washed or laundered away.