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.
Bleach to clean drain pipes.
This removes any small particles that are in the drain so they don t get in the way of the bleach.
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.
If you use bleach properly and with caution there s no need to worry about any possible problems that might occur with your drain pipes.
Step 2 pour 1 cup of bleach down the drain trying to pour it around all edges of the drain so it touches the sides.
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.
If the condensate drain line is clogged you will need to use a wet dry vacuum or a special pumpto unclog the line.
Run hot water down the drain for a minute or two.