Using a clay mitt on a ceramic-coated vehicle can indeed affect the coating. Here are some key points based on the search results:

1. Abrasive Nature: Clay mitts and bars are abrasive and can break down the ceramic coating. This is because they are designed to remove contaminants from the paint surface, which can inadvertently strip away the protective layer of the ceramic coating.

2. Effectiveness in Removal: While a clay mitt can help in removing some of the ceramic coating, it is not the most effective method for complete removal. It may lift some of the coating, but for thorough removal, other methods are recommended, such as using a dedicated ceramic coating remover or a polishing compound.

3. Proper Technique: If you choose to use a clay mitt, it is crucial to use it with a proper lubricant to minimize damage. Light pressure should be applied while moving the mitt back and forth.

4. Post-Cleaning Care: After using a clay mitt, it is advisable to wipe off any residue with a clean microfiber cloth and consider reapplying a protective layer, such as wax or a new ceramic coating.

Conclusion

In summary, while a clay mitt can remove some ceramic coating, it is not the best tool for the job and can potentially damage the coating. If you need to remove a ceramic coating, consider using specialized products designed for that purpose.

Here are some images of clay mitts in action for your reference: