I always thought Simple Green was a weak acid, but it turns out it's a weak base.
On bicycles and motorcycles, it won't hurt anything that won't wear out from other causes long before any chemical reaction from Simple Green caused any damage. Rinse it off, just as you would with any solvent or detergent.
I can see where you'd be especially careful about what you'd put on aircraft... lots of riveted plates and nooks and crannies, and just generally an enormous surface area that would take an inordinate amount of time to clean individually. AFAIK it's high pressure hose and maybe sponges or scrub brushes with aircraft. Not the toothbrushes and pipe cleaners we use on bicycles...
ETA: I use the Park Tool degreaser as well. It seems to be one of the least toxic ones out there. That's a relative term, though.
Last edited by OakLeaf; 07-18-2010 at 03:24 PM.
Speed comes from what you put behind you. - Judi Ketteler