Hi,
I have a dishwasher and my sink has a disposal. I am having a problem that i was wondering if i need a plumber to correct. When my washer is in use water comes up into the disposal side of the sink. Also sometimes i find water laying in the bottom of my dishwasher that is stagnant and doesn't smell very good. My double bowl sink drains have a bad smell in them quite a bit also and i use different products to take the smell away. Does this all connect to the same issue?? Thank you or any help you can give me.

Remove the dishwasher hose from the disposal and make sure there is no blockage. Also check and make sure the drain hose from the washer is looped up higher than where it connects to the disposal if you do not have an air gap. Also quarter a lemon and put through the disposal to remove the oder