Specifically, how do you use this on carpet stains?

Just spray on and toss in washing machine.

Do you use this in addition to laundry detergent or in place of laundry detergent?

You use with the addition of laundry detergent. Puracy makes a good one as well. This is a fabulous "stain remover" not a detergent.

Will this remove deodorant and yellow armpit stains on a white 100% cotton shirt?

It is the best stain remover I have found. I use for armpit and collar stains but it depends on how had they are. I use on new shirts and avoid stains longer and to lessen or remove stains already and here but it's effectiveness depends on how bad the existing stains are.

Allergen Information	Contains: Gluten Free
Units	1419.0 millilitre(s)
Brand	Puracy
Format	Liquid

Puracy Laundry Stain Remover Refill - Perfect Laundry, Pure Ingredients - with 6 SuperPlant Enzymes for Easy Removal of Fresh and Set-In Clothing Stains, 98.95% from Mother Nature, 48 Oz

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