Run hot water down the drain for a minute or two.
Bleach to clean drain pipes.
Bleach will not damage your drain pipes.
One way to do this is to close the drain and pour 1 2 cup of bleach with 1 gallon of water in the tub or sink.
On the other hand if you try to pour bleach down the drain in big amounts then yes your drain pipes will definitely be damaged and you can just throw them.
Open the drain to let the diluted bleach go down into the pipes.
This will kill any algae mold or mildew that has formed in the pipe.
Just pour a cup of bleach in the drain line s access opening near the indoor air conditioning unit.
Watch this video to find out more.
This removes any small particles that are in the drain so they don t get in the way of the bleach.
If the condensate drain line is clogged you will need to use a wet dry vacuum or a special pumpto unclog the line.