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Good question. It's not immediately obvious where it drains to, I assume it's underground somewhere. There's a dishwasher draining too although I've not noticed any smells from there.
@Dramatic_Hammer I've got decent access so that's probably a sensible place to start.
I get a whiff coming from my kitchen sink plughole when I take the plug out or run a lot of water down the plughole.
I've tried some drain cleaner down the sink but doesn't seem to make any difference. Any suggestions what might fix it/where to look?