Can I pour Mr Muscle sink and plughole unblocker down the sink after already trying bicarbonate of soda and vinegar...

[KittyFane1]

or will I kill us all with fumes? :(

Best not

What is it blocked with?

Does anybody pour cooking fat down the sink?

Have you got a sink plunger or (better) pump?

Do you know how to take the sink trap off?

Does water slowly run away, or not move at all?

When did it last drain properly?