According Spoonuniversity.com, if you put disposable plastics in your dishwasher, they could melt. Therefore, soft plastics (like the kind red Solo cups are made out of) absolutely cannot go through the dishwasher.
A company called Red Cup Living makes completely reusable plastic party cups that look a lot like Solo cups. Their cups are dishwasher safe, making them easy to clean after even a large gathering. They come in a range of colors and sizes. You can even buy reusable lids and straws to go with them. All their products are manufactured in the United States from BPA- and phthalate-free plastic.
If it weren’t for the dishwasher, the world would be a sad mess of dirty dishes. Because no matter how quickly you wash dishes, there’s always a great big pile of ones that need cleaning. It’s cooking’s biggest downfall — so many dishes. Dishwashers, in their glorious and mechanical way, have made the world a better, cleaner place.
The dishwasher, while great in so many ways, is way too rough for many of our most prized kitchen items. Before you start loading the rack with abandon, check out the 11 things that should NEVER go in the dishwasher shared by Huffingtonpost.com.