I had this issue and I solved it. The right earbud was very quiet compared to the left. I pulled off the filter and the mesh and cleaned them off. I used water because that is what I had on hand. I imagine Isopropal would be better. I used the following. I know its for the wireless buds but the idea is the same. https://www.youtube.com/watch?v=kDcKnM9fK4w The only problem with them now is that the glue that held the screen on is gone. It still kind of sticks so I am hoping it will stay enough. I am not doing any big movements with my headphones in so I am not too worried about it.
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