A clay mitt can potentially remove or degrade a ceramic coating from your vehicle's surface. While clay mitts are excellent for removing contaminants like overspray, tar, and tree sap, they can also be abrasive enough to affect the ceramic coating.

Here’s what you should consider:

1. Abrasiveness: The abrasiveness of the clay mitt can slightly wear down the ceramic coating, especially if used frequently or with excessive pressure.
2. Contaminant Removal: If the ceramic coating has minor contaminants embedded in it, the clay mitt can help remove these, but it might also strip away some of the coating.
3. Maintenance: For light maintenance, using a clay mitt gently and with plenty of lubrication can minimize the risk of damaging the ceramic coating. However, for heavily contaminated surfaces, a more aggressive approach might be necessary, which can lead to more significant removal of the coating.

If your primary concern is maintaining the integrity of your ceramic coating while removing contaminants, consider these alternatives:

• Use a Mild Clay Mitt: Opt for a fine-grade clay mitt designed for light contamination.
• Iron Removers: Chemical decontamination products like iron removers can dissolve contaminants without physical abrasion.
• Routine Maintenance: Regular washing and using a ceramic coating maintenance spray can help keep the coating in good condition, reducing the need for aggressive decontamination methods.

In summary, while a clay mitt can remove contaminants effectively, it can also impact the ceramic coating, so use it with caution and consider less abrasive methods for maintaining your coated surfaces.