How can I effectively remove pet urine from carpet padding?

To effectively remove pet urine from carpet padding, start by blotting up as much of the urine as possible with paper towels. Then, mix a solution of equal parts water and white vinegar and pour it over the affected area. Let it sit for a few minutes before blotting it up with clean towels. Repeat this process until the odor is gone. You can also use a commercial pet urine cleaner specifically designed for carpet padding.