In a large glass container, mix the salt, baking soda and cream of tartar. Stir until completely mixed.
Take 1/4 of the mixed solution and pour it into the clogged drain.
Pour the boiling water into the same drain. The heat of the water in concert with your effective unclogging mixture works well to break down and loosen build up.
Wait For It
Allow the drain to sit untouched for an hour.
Once the allotted time has passed, run the tap to clear out the clogged drain.
For those who need to unclog a drain and do not have cream of tartar handy, pour a 1/2 cup of baking soda down the drain and follow that with a 1/2 cup of white vinegar. Cover the drain (either with a drain cover or a small bowl) and allow it to sit for 10 minutes. Run water to clear out the build up.