Here's what i do:

I use a Park Tools CM-5 "Cyclone chain scrubber" and diluted dishwashing soap.

The Park chain scrubber has brushes that brush the top of the chain AND the sides. It works really well. (Park even recommends running the chain through it multiple times-- which is refreshing since most other brands only suggest using Ultra-Toxo Chain Kleen with their respective gizmos and that once is all it takes.)

Anyway-- i've used various chemicals: Finish Line "eco" stuff, Park's own "Chain Brite", Pedro's stuff, white petrol, paint thinner, White Industries degreaser.

And believe it or not, i've found the chain scrubber and dishwashing liquid to be just as effective as anything else-- actually moreso since the chain is physically SCRUBBED with soapy water. It's not toxic, no harmful fumes and the dirty water isn't an environmental disposal hazard. Plus it's far far CHEAPER.

The chain scrubber is a quality Park product so it's rebuildable. It also gets the chain cleaner than the old "chain in a coke bottle" trick.

I rinse with more water and blow dry the chain with my air compressor.

ProLink Gold lube seems to keep the chain cleaner, too.

Good luck