They don't share the exact same fuse but they are next to each other. See below. #6 is for the defrost and #7 is for the washer.
Can you follow and read a wiring diagram?
I have attached both diagrams below for you. They are pretty straight forward. On the defogger, it may have a bad timer module,,,that's what allows power to the switch.
On the washer,,,it's probably a bad washer motor.
If you are going to print these, please don't forget to click on accept so i receive credit.
Any further questions??