Summarize this article:

It is appropriate and courteous to pick up any trash or garbage before dropping your car off with a valet service. As the valet workers will be driving your car, it is respectful to tidy up and ensure that their experience driving your car is not a negative one. Remove any trash or leftover items of food at a gas station or service station before starting your trip.  Although washing the exterior of your car is not necessary, do so if your car is extremely dirty. Valet parking is a classy service, so ensuring that your car is presentable will be a nice touch before entering the drop off zone. It is a nice touch to hang an air freshener in your car if you smoke or if you’ve eaten any food in the car recently. Tipping your valet is an important thing to do, as valet jobs are difficult and drivers are sometimes reliant on tips to complete their full minimum wage. Plan on spending $2 - $5 (USD) on tips when you drop off your car, and 2 to 5 dollars when you pick your car back up.  Taking out ten dollars in cash and saving it specifically for tipping will keep you from not having any cash on hand when the time comes. Although a two to five-dollar tip is average, you can tip more if your valet was particularly professional and hard working. Before arriving at your destination, place your valuables in a bag, or take them out of your car before you leave for your destination. Although you should not assume that the valet will steal anything from you, there is no reason to risk theft by leaving something expensive in your car.  Things like electronics, wallets, or sentimental items should all be removed prior to dropping your car off. If you have items that you are not particularly worried about, you can tuck them under the seats of your car. The prices for valet services could vary significantly depending on where you are dropping off your car. Some businesses will provide complimentary valet parking, but others will charge you. Checking beforehand will allow you to prepare for the expense.  Ask if they take credit or debit cards, or if they only accept cash. If you are using valet services at a hotel, they will mostly like charge you a daily rate. When dropping your car off at the valet, there is a chance that your key could be lost. Although this is rare, it is not worth risking your entire key ring. Either bring a spare car key to give the valet worker, or take the key off the ring and bring the rest of your keys with you, keeping them safe and secure. Giving your entire key ring to the valet worker is also a pain for them, especially if you have an abundance of keys on your ring.

Summary:
Clean your car before entering the drop off zone. Stop to get some cash for tips beforehand. Remove any valuable personal items from the car. Call ahead for the price of the valet. Remove your car key from the rest of your keys.