I am turning my 24x24 cement block garage into a workshop.

I was going to leave the sheetrock ceiling in place that the previous owner had installed. I noticed a damp yellow spot and started to remove the drywall. I am glad I did. To begin with, the insulation was only 3 1/2" thick. Next I found that almost all of the insulation had been ground up and was actually one big roden nest. I had 4 Large trash bags filled with debris and droppings. I am not sure if it is Rats or squirlls. I also noticed that they had chewed the wire insulation.

I need advice on the following:

1- Now that I have removed the nest..will the rodents be gone?

2- What do I spray the ceiling joists with to remove any germs or smell?

3- Is there anything I can put up in the attic to keep the rodents out? (moth balls? Borax? Cedar shavings?

4- I am going to reinsulate. Anything I should put in to avoid the same situation?

Thanks in advance

Robert- Pittsburgh