Got about 100 replies from BMW enthusiasts about their detailing habits in these threads:
Survey: What do you pay for car detailing? - Page 2 - The Unofficial BMW M5 Messageboard (m5board.com)
Survey: What do you pay for car detailing? - BMW 3-Series (E90 E92) Forum - E90Post.com
The full survey results: Car Detailing Survey
Graph of the results:
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