Using a cup or container, remove as much standing water as possible
Pour an entire kettle of boiling water down the drain
If needed, remove the standing water and after it has cooled, pour salt down the drain before more boiling water
Use a plunger to remove debris
You can purchase mini-sink plungers from Amazon or Home Depot like the one here.
For kitchen sinks, check your garbage disposal
Turn on the disposal to clear the debris.
Throw a tray of ice or egg shells to clean out the debris
Purchase a drain snake
You can start with a cheap $3 plastic drain snake from Home Depot such as this one. You should have one in your home but if not, contact us and we can provide one to you free of charge
Alternatively, you can purchase a larger hand-held or electric one. Read this link for a more thorough guide.