I have been using a product to clean my chain and de-reailers called CRC. It is a marine lubricant and seems to take a good bit of the gunk off. I generally will use a rag soaked in the CRC to get in between gears etc.
Anyone else have a good product they like. I am really looking for something I can spray on my back sprocket and then hose it off.

PS. I have to protect against the saltwater so I am going over my bike once a week.

I just clean with liquid soap, warm water, and a cloth. Gets most of the stuff off. Cheap too.

Simple Green works well. It does the trick for my drivetrain and I don't have to worry about safe disposal of some scary solvent.

Oso

I don't use any cleaning agents. Just a clean strong cotton towel. I put my bike up on the repair rack and crank the pedals while I hold the towel and let the chain run through it. Works great!

Some lemon stuff. Soap and water with some scrubbing with a tooth brush and a towel. Rinse and grease.