Funny Story - just yesterday
I cleaned out my Lifereef skimmer collection cup - been about a month since I have done it. There was a thick wall of nasty stuff on the riser tube that came off and into the basement sink (those who have been ther know the layout).
Of course I had to use hot water because it cleans better , right - well heat also rises and with it goes the smell.
I had the basement door closed and my wife came home, she called from upstairs (basement door closed) "What's that smell".
It traveled up the stairs into the house with the basement door closed.
Kill me now!
House