I would not drive with your hull full of water and "slosh" it around. Bad idea.
You can ingest water into the engine that way, and that is not good. Also, your bilge siphons will be extracting the degreaser/soap/oil and dumping it out into the water in which you are riding, and environmentally speaking, that is not good either.
Just buy a bilge cleaner product, a degreaser, or try dishwashing soap and scrub where you can. Don't expect to get it spotless unless you are willing to spend lots of time repeatedly cleaning.