[Too Many Projects]

I agree with Mineral Spirits. I've tried a few of the non-toxic, environmentally friendly products but they just don't work nearly as well. Some will come close, given enough time to soak, but if you want greasy, dirty parts clean in a reasonable time, its MS. It will leave a slightly oily film when dry, which helps protect bare metal but if you are going to paint, the parts will need to be cleaned with Dawn and/or a good, solvent based, wax and grease remover.