Do all sewers smell the same?

what does your sewer smell like?

@Tennessee: I did sewer work for about 7 years. Not two of them smelled the same. :O)

@hminuk: what do vegan sewers smell like?

@Tennessee: I couldn't tell you every individual smell as smells are not too easy to describe - but it was obvious. :O)
Why the interest, if I may ask?