Yesterday I wrote about the HomePod leaving white rings on surfaces. There are some additional clarifications regarding the white rings.
The type of surfaces that are affected by this are surfaces that have been treated with wax or oil. This issue does not affect Medium-density fibreboard (MDF) wood, or any sort of other treated wood. This means that most surfaces should be okay.
The second clarifications that is needed is that this is not an Apple-specific issue. This type of issue also affects Sonos speakers as well as Amazon Echo devices. So this is not exclusive to Apple, but it can also affect Apple products.
The primary issue that is causing these white rings is the interaction of the silicone base with the wax or oil-treated wood. The chemical reaction that occurs between the two surfaces is facilitated by the vibration of the device and is the primary cause of the white rings.
Ultimately, what this means is that users who have oil-treated or wax-treated woods in their home will need to put something under their home pods, or other speaker device, it could be something as simple as a cloth, or even a paper towel. I would recommend something soft, like felt.