Bike Washing Detergent

[ghammer]

Yup, I'm one of those who wash their bikes after messy/sweaty rides. I loathe to put a well ridden bike away filthy, and if it resembles grimy, I scrub it down. As a result (apart from nicks and small scratches), my 7 year old bike looks pretty much new. And I have a super quick routine that'd put Conti's mechanic (Muñoz) to shame.

But I'm tired of paying premium for "bike-related-detergents". Makes no sense to me. Isn't a detergent a detergent?

For those of out there who wash their bikes, is there a household, average supermarket brand that'd be safe for bicycles?

Thanks,

G