Suggestions for easy peanut butter clean-up
The problem is the fat. You would have the same problem with a spoon full of shortening.

Since fat doesn't normally mix with water the fat makes a film that gets on everything. The solution to fat- or rather to make a solution of fat- you use soap.

You are trying to wash away a very large quantity of fat so it takes a lot of soap. Instead, scrape the majority of the fat into the garbage. Apply a liberal amount of soap and work it into a solution with the peanut butter residue.

The peanut oil, now in solution, will wash away nicely without coating everything.