To clean out the drain pipe between disposal and other sink fill the disposal with ice cubes. Run disposal with a little water. You are trying to make slush and this should fill the pipe and push through any blockage. If it starts to come up the other sink ok. Then run hot water to finish melting and flush system.
Using a garden hose to get extra water to the drain may also work. Put the end of the hose on the sink drain as you are trying to use the pressure of the water as well as the quantity of water.
The pipe can also be easily removed. Take a look at YouTube for suggestions.
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