I second Dr. Bronners, although I'd suggest trying the unscented version; it's the only one so far that doesn't burn my nose when I clean my septum. They come in little 2 oz bottles too, so you don't have to commit to a huge monster bottle.
MODS: 4g lobes, 16g anti-tragus, 10g septum, three tattoos
RETIRED MODS: 2x 16g helix, 14g helix, 18g lobe
FUTURE MODS: 2g lobe stretch (0g goal size), more ink, 4g conch, navel