Where is the rear window washer fluid refill located on a 2006 gmc Denali?

On a 2006 GMC Denali, the rear window washer fluid refill is located in the same reservoir as the front washer fluid. You can find the reservoir under the hood, typically near the driver's side. Look for a cap labeled with a windshield/water symbol, which indicates where to add the washer fluid. Be sure to check the owner's manual for specific details if needed.