help with cleaning BMPCC4K sensor/lens

Hello all, please see this video clip showing the issue with my BMPCC4K.

Appears to not be on the front lens glass as it stays static when I zoom in and out.
Any suggestions as to what it is and how best to resolve?
Many thanks, Elahn.

AFAIK it cannot be cleaned...

You need to get the IR Filter replaced... (which is above the sensor...)

Hi, it seems like a problem with the internal IR Filter above the sensor. This post discusses it.

viewtopic.php?f=2&t=194887

I replaced it with a filter bought on ebay, just the glass, and the replacement was quite simple.
Maurizio