Related Clues:

• Pure as the driven snow
• Spick-and-span
• Optimal
• Perfect example
• Like paragons
• Like no human, according to the Bible
• Standard of perfection
• High goal
• Unimprovable
• Meriting a ten
• Beyond improvement
• Rarely-met goal
• Worth a ten, maybe
• Beyond compare
• 10 out of 10, e.g.