To clean something to make it free from germs or dirt.
Sanitize makes people think of being clean and safe from sickness.
Examples:
I need to sanitize my hands before eating.
She will sanitize the kitchen before cooking.
The hospital staff sanitize the rooms every day.
I will sanitize my toys so they are super clean.
He sanitized the entire house from top to bottom.
After the party, we sanitized everything to make sure it was all clean.