How do I clean items?

How do I clean items? - White Petaled Flower

I have found some Grimy food. I also have heard of a trap that will make my items sticky. Can I clean these items or is the change permanent?

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How do I clean items? - Clear Glass Stones Hanging

How do I clean items? - Collection of stainless steel straight and bent straws placed on reusable bags on table

How do I clean items? - Two Clear Drinking Glasses on Table

How To Clean/Polish Silver Items At Home | चांदी के बर्तन चमकाने का सरल तरीका | Diwali

Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.

Images: Evie Shaffer, Peter Fazekas, Sarah Chai, Andreea Ch