[HELP] 80s movie with video inserts

[Selur]

Seems like someone messed up mixing interlaced and progressive content and then resized
If you just want to filter the chroma:
a. set 'Split Compare View' to 'Split YUV' this way you see in the lower row what happens to the chroma
b. use try different denoisers and restrict their effect to chroma only (Merge Y=0;U=V=1)
Here's an example of MCTemporalDenoise(settings="very high") restricted to chroma:

The Y plane is untouched and just the other two got the filter effect.
If you want to remove fines chroma noise, use a degrain instead of a denoise filter.

Not really sure what you are aiming for, but maybe using CAS(0.7)+SpotLess(tr=3) (!in that order!) does what you want

Cu Selur