> Citrus-scented most likely because it is citric acid based.
More likely it is d-Limonene, the major component of the oil in the rinds of citrus fruit. This is the active ingredient in Citra-Solv and many other "citrus-based" cleaning products. Although probably better for the planet and you than petroleum-based solvents, it still should be treated with care and rubber gloves. I have heard that most solvents can carry other toxics (metals for example) across the skin where they can get in the bloodstream and thus collect in the liver. I am sure no expert on this stuff though.
Here's a description of the stuff, from a company that makes it so don't
expect it to be too critical:
Excerpt from the MSDS (material data and safety sheet):
"...can be used as a replacement for toxic chlorinated solvents, glycol ether, MEK (methyl ethyl ketone), xylene, Freon, and CFC's, parts cleaner, engine degreaser..."
It is most effective as a degreaser if you don't dilute it with water.
I've used it a lot and not had it take chrome off, perhaps because I don't add water, but also I don't let parts stand in it for a long time.