I doubt that there are many people who have never spilled oil in their bilge. Cramped quarters in a moving object will do that. If it never amounted to much you are lucky, But often the outcome over time is that of pervasive fumes and residue where you can't get to it. In NH and Eastern Mass I can come apply this cleaner and get it done, but otherwise you are on your own. Here I can show a product that really works, leaves no odor and is completely safe. It is legal to discharge the remains in your hold into the harbor, and it does not pollute.
The main component of this has been around for millenia; Bacteria. These buggies are actually necessary, just like insects, for our continued survival. They have an incredible variety of specialized niches in the environment. Some can turn oil into water and harmless amino acids. They exist naturally in most fertile moist barnyards. Provided with the right nutrients and food, in this case your bilge oils, they multiply exponentially and eat all the oils they can get to. They have been naturally bred, not Bioengineered and made into a produst called a Biocleaner. Apply this with a sprayer or sponge, no gloves needed. Leave enough water in the bilge so that it sloshes around and go out and enjoy a wavy day. Let it sit and pump your bilges later. Exact instructions for mixing the solution with water first are on the bottle. Plus they tolerate salt water. There are absolutely no fumes created while doing this.
The cost of enough product to remediate the oily bilge on a yacht is only fifty dollars. If you have a more commercial operation and accumulate a greasy buildup you will need to scrub or pressure wash the area, but they will still be happy to eat it all up.
Buy Biocleaner for US $ 50.00