Backstory

There is a gap between the ground and the wall. Inside I can see the insulation that is there.

Problem

Unfortunately the pet made this insulation a temporary toilet so it has been peed upon a couple of times.

Trying to fix

I've removed the visible part of that insulation (by pulling it off as best as I can) and now there is this gap left, where the insulation is underneath.

I've sprayed the area couple of times with enzyme cleaners (including the gap with the insulation), it still smells weird inside. Can't really tell if its pee or insuline smell, if that's something.

Request for proper solution

How can I make sure that the smell is gone?

Should I fill the gap between the wall and the ground with some kind of filler?

Thank you