I have disassembled the taking lens of my Yashica Mat-124g and tried to clean it. First, I used 99% isopropyl alcohol and it didn't help. Then I used a 1:1 solution of hydrogen peroxide and ammonia and it also didn't clean the lens.
I have realized that the problematic piece is probably a group of two glued lenses and it may be that dirt is in between the elements. Is that possible?
What other cleaner would you recommend? Acetone?
Here are some photos where you can see some haze: https://www.flickr.com/photos/radoburansky/
I believe this is how the taking lens look like: http://www.yashicatlr.com/LensesShutters.html#viewing