Grease traps are one of the most common household appliances. They’re used to catch grease and other oils that can build up over time and cause problems in your home. To clean a grease trap, first make sure it’s empty. Pour a pot of hot water into the trap and wait until the water is hot before pouring it out. Pour a pot of cold water into the trap and wait until it reaches room temperature before pouring it out. Next, use a plunger to suction onto the drain pipe above the trap and push and pull until all of the gunk comes out. Make sure to get down into the crevices where the grease collects. Finally, pour a pot of bleach down the drain to kill any bacteria that may have formed during cleaning. ..