Drain cleaner is a very useful item, but it is a little scary because it is so toxic.
You begin by boiling the 5 gallons of water.
Then you will add an entire bottle of Dawn into your greasy sink clog.

Image By: 1 Tom Plumber Via YouTube
Then, you will add the boiling water.
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This method works extremely well, I just love it!

Image By: 1 Tom Plumber Via YouTube

Image By: 1 Tom Plumber Via YouTube