Be careful with the shop vac if there's anything like oil or gas in the bilge. The vac could ignite the fluids as it sucks them up and creates vapors. Use a sponge and a bucket or a hand pump if you think there's anything flammable in there.
Thank you...I forgot to add that in. I always add a good amount of soap to get things broken up and leave the blowers running. I also keep a bilge pillow down there to soak up the oil and scum