I find strange the juxtaposing of kids and bike grease with dog paws (...?).
I mean I'm pretty far from being one of those "BUT CHEMICULS!!!" sort of people but I do draw the line somewhere. If my kids want to eat dirt in the woods? Fine by me. I'm sure the older one has sneak eaten more than one poo from the forest floor. They're so quick when they want to be.
But petrolleum distillates combined with lubricity additives mixed with road grime, exhaust pollution and tire derived nano particles does make me uneasy especially when my kids would stick that stuff in their mouths or eyes. Also properly black gunked chain oil doesn't come off in the wash after it makes contact with a cotton garment.
Maybe I'm overreacting. Maybe toddlers and solvents do mix after all?