Two large bath towels will be more than enough. I got three of the Royal Velvet and I don't even use one entire towel (cut into squares) to wash, dry, polish and apply sealent to my car. I own a 99 Camaro so you know I use alot of towel.
The towel I have is really thick. Once one side is gunked up, I flip it over for the other side as if it is a new towel all together. One large towel made 9 peices and both sides equal 18 peices.
Two bad I cut up three towels and I'm using the old rough ones for myself