Back in 2013 yes, that long, I started a research on noise and came with several solutions, each addressing specific noise, none being 'the silver bullet'.
This time my inspiration came from a thread created by rmalarz. In his thread rmalarz posted his own research on predictable noise. rmalarz posted his test image and I got 'upset' as his image was a JPG and asked for something that not messed up with JPG compression. rmalarz complied by posting another image, a TIFF. Visually, comparing the two, the change was invisible yet there was something as the histogram had variations in the Blue and Green channels and none in the Red. I decided to compare the images using PS CC. So I took the two images, placed them on top of each other and used 'divide' as blend mode. 'Bingo!' I saw where the modification were made. Great. Problem is something was tugging in my mind.
It took me about two night of insomnia to crack it. If I could isolate difference so quickly, why is it not possible for other purposes?
I took rmalarz initial JPG as a test file, with his permission. I immediately found that I was able to correct the color artifacts in it. As this could be a fluke I requested folks to send me a few noisy captures in the post processing section. A few answered and gave me various forms of noise.
It instantly became apparent that I was dealing with a fluke. Then I realized that the solution was specialized in removing JPG color noise.
I tested my 'discovery' with older images I had requested in 2014 and could not correct. To find my old research I reopened many of my ancient threads. This led me to a surprise!!!

- Open the capture you need to correct.
- Duplicate the layer
- Select Menu>Filter>Blu>Gaussian Blur
- Set the blur level high but in proportion to your originals. On the sample I was given I used 8px or 16px so be generous here.
The image will now be a blur.
- Change the layer mode to color. Please not that I found out that 'Soft light' and 'lighten' can lead to better results depending on the image.
- Select an area that offers the greatest number and variety of color noise
- Magnify the image to 400%, yes, pixel peeping.
- Open the layer blend mode
- Select the channels in the 'Blend if' area
- Leave 'Grey (luminosity) selected.
- Using the top layer left slider push it slowly to the right. Some if not all of the color noise will simply go away.

If not:
- Alt click on the black arrow. It will split into two. Slowly move the left side toward the left. This create the range luminosity range that will affected by the blend mode.
- Using the lower layer right white arrow do the same thing but reversed (slide to the left, split arrow, slide to the right)
- Change the channel to 'Green' and proceed as above.
Normally all the color noise should be gone.
If not use the blue channel as described above.
DO NOT use the red channel.
- Click ok.

Ok, now you have eliminated the color noise but the image is lacking punch as it has lost quite a bit of luminosity and contrast*.
You could create and adjustment layer but there is a better method.
- Bring the image to a more normal viewing mode (Ctrl-0)
- With the layer selected press Ctrl-L**. This brings the level menu. Adjust as need to adjust the histogram clipping***. Then using the mid range arrow well, adjust the luminosity to your heart content.
- Merge the layers.