2003 Rx330 Heated Mirrors

[semp19]

Does a 2003 rx330 have a liquid chemical in heated mirrors that can stain the clear coat when released due to the glass breaking? If so what is this chemical? How do you remove the stain besides trying to wet sand and polishing. Compound did nothing to the stain. I am an estimator for a body shop and have this insurance claim right now that the customer claims a chemical was released when his mirror broke. After replacing his mirror and washing his vehicle his points this stain out that ws never brought to my attention. Please help!

[SKperformance]

It is a lcd panel behind the mirror that has leaked out. It is used to dim the mirror from glaring rear headlights.

Other than wetsanding it may not come out.