Hand Soap. Sir you may need to learn how to wash a car before you ruin the paint on your new FR-S.
[ame="http://www.youtube.com/watch?v=X0Sqi1lAj1A"]Audi R8 BLACKBIRD: Basic Car Wash Techniques - /DRIVE CLEAN - YouTube[/ame]
Put some rubber kitchen gloves and waterproof boots on and your hands wont get cold.
Go to Autozone. Buy some high quality car wash.
Meguiar's Gold Class or Deep Crystal Car wash or..
Do not get that wash + wax garbage. 2 microfiber mitts, 2 microfiber drying towels, and 2 buckets. One mitt use only for the body of the car, and the other mitt only use for cleaning the wheels. Spray car with water. Put soap in bucket, fill with water. Work from top to bottom. Clean a section at a time, washing off the mitt and getting new soap from the buckets after every section. Hose all the soap off the car. Dry using a couple drying towels or by driving down the street.
Do not continuously scrub an area unless necessary, the more you touch the car while washing the more you put fine scratches into the paint.
Apply wax after. You may need to check another tutorial on that.
TLDR: If you want to learn how to wash a car, hire a detailing specialist in your area to handle the initial cleaning of your car and watch him do that. I'd recommend searching for a person who specializes using Meguiar's products, (or search for any other high quality brands), and is using the newest Meguiar's DA microfiber kits etc.