system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5:What is hot water doing that makes cleaning dishes etc easier that cold water isnt?
gpt
More heat: more energy to the molecules.

More energy, more movement, the molecules will weaken and cut the low energy bonds that let them stick together like hydrogen bonds or Van der Waals bonds. 

In this way fat molecules won't have a strong grip on other fat molecules. 

Think of butter, it needs very little heat to reach a liquid state, because they are have enough energy to destroy their bonds.