Why can't I machine wash my small memory foam pillow? It has a cloth cover on it.?

Well, I didn’t say the entire pillow was cloth. It has a memory foam core with a down outer case that can be unzipped and removed- the foam core is one piece but has a cloth cover sewn around it. Meaning its not a bare foam block.
It was expensive and something has happened to it that i feel needs deep cleaning- it’s not something I can spot clean. Thanks to those of you that can respond without being jerky.


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