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Kitchen Sink Piping/Nightmare Potential

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Hello - I really need some solid advice. I recently purchased a home that has started having an awful smell coming from kitchen sink. I've cleaned multiple times, including p-pipe. Finally called a plumber & they said they will have to tear out the wall & lower the pipe where my kitchen piping is connected (sorry, not a plumber) to the street I'm guessing. What I am wondering is if I replace the wonky snake like piping the previous owners installed, with a 'real' pipe, will this allow the food etc to not get trapped & eliminate the smell? (Please see photo) I really-really-really do not want to have my wall torn apart to fix this issue. I also do not have the $$ to pay $3500 for them to do it which does not include the outside restucco which will add at to my final cost. I just want to be sure this is correct. The smell is not consistent either. It comes & goes. So I'm hoping by removing the wonky snake-like hose with real hosing it will fix this issue. Maybe I could dump some pinhole down the garbage disposal & really clean it out 🧐 I truly appreciate any advice as I have ZERO plumbing experience, but I make a mean chocolate chip cookie 😁 Thank you - Thank you!!
 

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Yes, it seems likely that it’s to do with the flexible pipe going through the cupboard or wall, but by doing it in rigid pipework won’t eliminate it, it needs to not go uphill. Also which might be contributing is the coil of grey hose from whatever appliance that is.
 
Yes, it seems likely that it’s to do with the flexible pipe going through the cupboard or wall, but by doing it in rigid pipework won’t eliminate it, it needs to not go uphill. Also which might be contributing is the coil of grey hose from whatever appliance that is.
Thank you - the other grey hose connects to the dishwasher. But no smell is coming out of the dishwasher, only the sink. Do you feel there any way to NOT have to cut out my wall? It's okay if you cannot answer. It just seems like I can remove the white pipe (circled in red on pic) and replace the p-pipe connector with a pipe that is more straight across??
 

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It’ll smell from the dishwasher hose anytime water is sent down the plughole allowing the odour in. If you can fit a straight piece of pipe, see if you can get a running trap, or a hepvo valve, as if you don’t fit a trap, smells can emanate into the property. As for exposing the wall, I’d start easy by changing the pipes as suggested just and see how’s you get on.
 
If the black thing is a waste disposal unit for the sink and washing machine, then there shouldn't be drain smells, perhaps a bit of stagnant water in the WDU is the cause. Or if the pipework is siphoning out the trap, then something like an air admittance valve would solve the problem. My feeling (subject to site investigation) is that if you were willing to lose the waste disposal unit, that problem could be resolved for £150 in the UK. Not sure what it would cost where you are, but I very much doubt anything close to $3000 is needed.

My advice is get a second opinion from another local plumber.
 

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