is this better than clorox pens?

I found this to be a better pen than Clorox pens.

Does the Tide pen work on stains that have set in? (I've already washed the shirt once and there is still a stain)

I have had set in stains like blood and wine. They were removed from cotton fabrics with the Tide pen. Great product.

3 Count x 6 pack includes 18 Pens ?

I thought I would get 6 pens. But I received it today & there's only 3 pens.

Does this remove sweat stains from dress shirt

This works best on smaller stains. Sweat stains are usually on a much larger area. I’ve have a lot of success removing those with a product like Spray n Wash, worked into the stain before a wash. It would take forever and you’d need all three pens or more liquid to remove underarm and neck stains.