Toy Batteries How Do I Clean The Battery Compartment Of A Toy Left W/batteries Over The Winter That Has Completely Corroded?

How do I clean the battery compartment of a toy left w/batteries over the winter that has completely corroded? - toy batteries

I left the battery in my son-powered bubble blower in the garage in winter. I have today and the battery is completely corroded. To make matters worse, I washed with water. I have tried some corrosion wiped clean and the toys and put new batteries in it, but it does not work .... Ideas, suggestions, ideas?