Default Black spots on camera experiance.

My experience.
My backplate had cracks and needed to be replaced so I taught I look at the camera that has black spot syndrome.
Tried to clean it with compressed air.no use.
Dissembeled cameras lens part (needs soldering) and cleaned sensor.
Looks like some spots are gone but most of them are there.
No thinking that the problem isnt sensor but lenses.to be exact between lenses part that cant dissasemble easily.

Has enyone tried to fix it by himself?