Sinks, tubs, and toilets aren't the only ones with traps that can become clogged. Dishwashers, washing machines, and waste-disposal units can occasionally back up as well. Here's what you can do when they get clogged.
1.
For Dishwashers
a) If you’re sure it’s a clogged drain pipe and not a malfunctioning drain valve solenoid, remove the drain port cover, and thread a slim rod or auger down the pipe to clean the trap. If you can get under the machine, you may be able to drop the trap and clean it. (Fig 1.)
b) If the strainer is blocked, lift it out and clean the ports under a tap and rinse.
2.
For Washing Machines
a) If the problem is a clogged trap, remove the drain hose, insert an auger in the pipe, and run it down through the trap and pipe. (Fig. 2)
b) If the blockage is in the discharge hose, inspect the hose for any kinks or severe bends. Remove the hose using a screwdriver if the hose is held with a worm clamp, or pliers if it's held with a spring clamp. Use a wood rod to push out the debris, or aim a faucet into the hose opening and turn on the water to force out the debris.
3.
For Waste-Disposal Units
Clean out the trap. If the disposal is connected to a sink drain, remove the connection and pipe, and then clean out the pipe or the sink trap/pipe.
