Painting is nice, but cleaning is not so much.
Here is a trick to make washing the paint bucket easier.
If you use different colors, it's ideal! No need to wash the bucket with each change.
Find out how to make the cleaning chore easier:
Use a thick plastic bag such as Ziploc or Albal to protect your bucket. With every color change, change plastic.
And when the work is done, just give the bucket a little swipe, which is hardly dirty!