Home Improvement Questions? Ask a Handyman for Answers
Welcome to Just Answer, my name is ***** ***** I will do my best to help you with your issue. If my initial response doesn’t answer your question then let me know and we can continue our conversation.
You'll either need to clean the trap(s) under the sink or snake the drain line.
You can't run the dishwasher since it's tied into the same drain. You don't need to turn the water off to the sink to clean the trap(s). Don't understand last question
If a third sink also has a problem it's an indication that the problem is further down the line and that the drain line will need to be snaked. Calling a drain cleaning service to do this will probably be less expensive than calling a plumber.