Been under offer for several weeks - drains starting to smell

[duro1]

Do I have to declare? They are not having a survey??!! I am single parent struggling, they have couple of other properties... I know that probably doesn't matter but it does to me ie. can't afford any problems

[MissMargie]

My drains smelled after house had been empty for a few weeks. Disappeared with use- could it be that?
Water and bleach down all drains - we have a cesspit so can't do that

[PokemonGo]

Can you pull up some drain covers and have a look?

[sall74]

Where is the smell coming from? The plugholes in the house? The manhole cover outside?
Powerful drain unblocker really isn't expensive and works very well on blocked plugholes.