I have several spots showing up on my image from dust or something stuck on my ND wheel or on the sensor. It's not on the glass that's over the ND wheel but actually stuck on the inside. Wondering if anyone has had this issue or know of a safe way to clean it?
It is is inside the glass, I fear that your only option is probably to send it in for service to have it cleaned off. There is not any way to remove the filters to get behind them (at least while keeping your warranty intact).