There are a few different methods you can try to simply pop the dent out of your washer and dryer and return them to their original shape. Pour hot water directly into the dented area to start. \
Sometimes, the heat will cause the metal to expand and the dent will pop out on its own. If that doesn't work, try alternating between hot and cold. \
Use a hair dryer to heat up the dent, then switch to a cooling spray of air. The rapid temperature change can sometimes make dents pop out on their own. \
You can also use a plunger to pull out some dents. Place the plunger right over the dent, get a good and firm seal, and pull up. \
One of the most effective ways to pop out a dent is to address it from the other side. When you can access the back side of the dent, it's an easy enough matter to apply pressure to the center of the dent and force it to pop out this way. \
However, it isn't likely that you can access the other side of the dent when your washer or dryer is dented so you will usually be using other methods to repair a dent. \