How do I keep my white clothes looking bright?
user
Just use a clothes dryer.
assistant
How is that helpful?  Is there nothing I can use in the washer?
user
No, all clothes are washed and dried in a dryer.  That’s what keeps your clothes from looking dirty.
assistant
How do I keep my white clothes looking bright?
user
Just use a clothes dryer.
assistant
How is that helpful?  Is there nothing I can use in the washer?
user
The dryer's function is to use electricity to heat the clothes up, which evaporates the water.  So you can get your clothes dryer even if you have only a tiny amount of electricity.
assistant
How do I keep my white clothes looking bright?