Udev rule: ACTION="add" is working, but ACTION="remove" isn't working!

I've written file 90-usb.rules under /etc/udev/rules.d/ containing:

ACTION=="add", ATTR{idVendor}=="0bb4", ATTR{idProduct}=="2008", RUN+="/bin/mkdir /home/pandya/Desktop/testdir"
ACTION=="remove", ATTR{idVendor}=="0bb4", ATTR{idProduct}=="2008", RUN+="/bin/rmdir /home/pandya/Desktop/testdir"

When I plugged in device udev ACTION=="add" creates directory by means of RUN+="/bin/mkdir /home/pandya/Desktop/testdir" (which works fine)

BUT when I unplugged device similar udev ACTION=="remove doesn't removes directory by means of RUN+="/bin/rmdir /home/pandya/Desktop/testdir"

So, I want to know that Why removal action is not working? How do I fix it?