After been affected by YouTube algorithm, I found this video from Engineer Bo.
In a nutshell, adding polarizer to your microscope removes all the reflection to easily see markings on SMD parts.
Here is an example a PCB I had laying around of my sumo robot motor controller.
You can also notice adding a filter helps to see the PCB contamination.
After checking that video, I immediately when on Amazon to see how much it cost to get 52mm circular polarizer. I then had better idea and search locally with Facebook marketplace and found one for 4$ US!!
I then downloaded Bo 3D files from his account
https://cults3d.com/en/3d-model/gadget/52mm-circular-polariser-mount-for-electronics-microscope
I then ordered polarised film sheets that I glued to the LED ring transparent lens.
As I work on my sumo robot, I got an aluminum splitter in my finger. Guest how easy it is to spot it!
Greatest thing since sliced bread!