I'm surprised no one here has mentioned rinseless washes like Optimum No Rinse (ONR) as an option for washing your car. You dilute it with water in a 1:256 solution in a bucket, and then you use a slightly-dripping microfiber towel or a rinseless-wash-specific sponge to clean your car. The rinseless wash itself acts as its own drying aid, so you can wipe your car dry with a microfiber drying towel afterwards without having to rinse off the car (hence the term rinseless).
I would say this is the cheapest, simplest, and (arguably) safest way to wash your car, especially if you buy the rinseless wash concentrate by the gallon. It's easy enough that it allows me to wash my car nearly every week. I only need about 3 gallons of water and 1.5 fluid ounces of ONR to fully wash one car.
I would say this is the cheapest, simplest, and (arguably) safest way to wash your car, especially if you buy the rinseless wash concentrate by the gallon. It's easy enough that it allows me to wash my car nearly every week. I only need about 3 gallons of water and 1.5 fluid ounces of ONR to fully wash one car.