We had a blockage along a row of a few houses recently and since it has been cleared the house in the middle has a very stinky drain. When they have a shower, we can smell their outside drain - we have windows open and the smell is so strong it comes into our upstairs room. It's like a sewage smell.
Options:
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Do nothing it's not our drain or place to tell them what to do with theirs.
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Politely knock and make them aware that we are suffering from the stench so could they try to do something about it.
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Actually buy a product and take it round and ask them to use it on their drain to resolve the issue.
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Something else - feel free to suggest?
Thanks