To wash a quad good you need; a pressure washer, a scrub brush, four wheeler stand, soap, and an exhaust plug so you don't get water in your exhaust.
To start washing a quad, first you need to put the quad up on a four wheeler stand.
Next, you have to put an exhaust plug inside of the exhaust so you don't get water down the exhaust and hurt your motor.
Next, fill up a bucket with a lot of soap and water.
Next, put all the soap and water on the quad and let it set for about a minute.
Finally, wash all the soap and water off of the quad, and look at is shine.
My dad taught me how to wash a quad. He taught me really good because every time I wash it it shines like a diamond.