I think and read The Classic deagreser are Dawn/water, Ammonia, Acetone. And I think they have minute differences usage. I read many post about Degreasing. -> Use them by turns// When old stain use acetone// When oil Embedded, Dawn/water is effective...etc. But, I don't know clearly about differences yet :'( Is it just Feeling or Experience? But, distinctly they have difference characteristic.. How can I choose appropriate Degreaser in many situations?