Isopropyl (rubbing) alcohol and a wash rag. Pour enough in the bottom of the bucket, and wipe the bottom and sides down with it. If you have a second bucket to "de-vinegar", you can use the isopropyl in the bucket a few times, so pour it in to the next on and keep going. As soon as you wash out one, fill it with water, and swish it around.
The Acetic acid (vinegar) gets trapped in the pores in the plastic, and the Isopropyl does a good job of releasing it even when detergents can't.
Obama is a PsychoSomatic Disorder: He is a Psycho that is trying to get you to take the Soma, so you will not see the Disorder that his "Hope and Change" is spreading.