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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

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It's entirely possible for haze to come from degradation of the cement gluing two elements together, and it's really not possible to clean it. It could also be that the surface of the elements has been etched by the acid produced by fungus, and the only way to remove that is to repolish the elements, but this may change the optical character of the lens.

See this discussion thread on the mflenses forum about cleaning hazy lens elements.

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