Is a drain snake the right tool to clean a long-term clogged bath pipe?

Question

OK, I'm not sure how to explain this best... If you have a better wording in mind for the title, please edit or tell me:
The setup: I live in an apartment. The bathtub after the U-bend connects to pipe 50mm in diameter. That pipe then connects to a larger pipe (100 or 150, not sure) which then connects to the vertical sewer pipe. The 50mm pipe is straight and about 1m long - but it passes through a wall so I can't remove it. The bathtub connects to the 50mm pipe via a 45 degree junction and the 50mm also continues on in the other direction towards the kitchen.
So.... in Ascii art...
                                        Neighbors above
                                               #
Kitchen       Bathtub                          #
   |             |      1m        Fat pipe     #
   ---------------------------===============#
                45°                            #
                                               #
                                        Neighbors below

The problem: I can clean the U-bend easily enough, but the straight 50mm pipe is another story. Over time it clogs and the bathtub starts draining slowly. With great difficulty I can get disassemble the connection to the kitchen and remove the 45° junction and poke around with a long stick which helps... for a while... but it's a pain to do so. I could however easily access the 45° junction and put a drain snake it (well, if I had one).
What fills me with doubt is that everything I read about drain snakes suggest that they are for removing acute blockage - something big suddenly stuck in the pipe. You can dislodge that and everything is fine. In my case however it's a slow buildup of gunk over years of time. The pipe doesn't block, it's more like it's inner diameter slowly shrinks... And I doubt if gettin a drain snake would help here. If there was something like a 50mm round brush, then maybe... but I can't find any.
Am I overthinking it and a drain snake is exactly the tool for the job, or is there something more specific for this scenario?

jay613 · Answer

A. Chemical drain cleaner ought to do a reasonable job in this situation
B. Yes there are snakes with attachments like you suggest
C. If you are renting perhaps the inaccessible part of the plumbing is the owner's responsibility.  Without getting into a big discussion about legalities wherever you are, you could ask nicely.
D. Usually a frequently blocking bath drain is caused by someone with long hair who uses too much conditioner.  Get a good hair screen for your tub drain and instruct any such user to clean it during and after each use and to go easier on Hair products.  Require each such user to participate in the disgusting business of clearing the drain.
E.  A common horizontal pipe shared with the kitchen is a whole other level of problems.  I've never seen that before.  The combination of cooking fats etc plus hair is formidable.  Assuming you don't own this mess and can't improve it, you may want to create some kind of Easy Access to do cle an outs.

jay613 · Answer

This answer to illustrate the comments about how venting might be a minor factor for OP.
Here is a picture of three fixtures with added venting for the bath and sink.

And here is the same picture where I've highlighted in red the section of pipe that is analogous to your problematic one, and in green the venting that you do not have.  You could imagine the basin in this diagram to represent your kitchen. (Note in this diagram the vent is connected to the main stack incorrectly, it should not be at 90 degrees but presumably in this diagram it is the upper floor of a house with no water flowing from above).

Is a drain snake the right tool to clean a long-term clogged bath pipe?

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