If you've got moss taking over a patch of your lawn, stop buying stuff to kill it. Moss isn't the problem.
Moss doesn't kill grass and it doesn't choke anything out. It just moves into spots where the grass was already losing: deep shade, packed soil, poor drainage, or chronically damp conditions.
Those are all things grass struggles with and moss tolerates just fine. So the moss isn't attacking your lawn, it's telling you the grass was never thriving there in the first place.
Which is why moss-killer is usually a losing battle. You can rake the moss out or spray iron on it, but unless you fix the shade, drainage, or compaction underneath, it usually comes right back.
Stop fighting the one thing that actually wants to grow there. That little patch of moss holds water, protects the soil, shelters tiny creatures, and never asks you to mow it. Let it have the corner.