Water and dirt within foci and intermittent

Hello everyone.

I have a 1.9tdi Passat. It is the 2004 model.

The lateral intermittent has it in the mirrors. Do you know how to disassemble to clean it? I have it black inside. And I'm afraid to break it by disassembling it.

It also enters water in one of the rear spotlights. How can I access and close the water entry into the rear lights?

Thanks in advance.
All the best.

A without disassembly solution: most of the foci are plastic mica. The solution is what comes in and how we manage to get the water that can be not by filtration but also by condensation. With a little hole in the lower part with a drill of about 2 millimeters, you can also seal without disassembling with some silicone, but the drainage is important