Your passenger is responsible for the cost of cleaning after making a mess in your car.
Explain to the passenger that you will not be able to pick up other passengers, and this will affect your earnings. Politely request to be compensated for the mess made, and exchange contact to make own arrangement.
You may consider, having plastic bags in your car in case of any passenger who feels like vomiting. If there are pets, having newspapers or covers to keep your seats clean will come in handy as well.
Let us know, together with photo evidence if your passenger refuses to pay or is intoxicated, and you are unable to collect cleaning fees through the form below.