Mattress Stains
A mattress cannot be rinsed, so the job is to lift the stain with as little liquid as possible and dry the foam fast. These three cover the stains that actually happen.

How to Remove Blood From a Mattress, Including Dried and Period Stains
Clean blood off a mattress with cold water and an enzyme or peroxide treatment, using minimal moisture because a mattress cannot be rinsed or wrung.

How to Remove Urine From a Mattress: Bedwetting, Pets, and Old Stains
Clear urine and its smell from a mattress with an enzyme cleaner that breaks the uric acid crystals plain cleaning leaves behind.

How to Clean Vomit From a Mattress After a Stomach Bug
Remove vomit carefully, clean the mattress surface without soaking its core, launder soiled bedding, and understand the limits of disinfecting porous foam.
More stain & cleaning topics
Clothing & Fabric Stains
Stains on things you wear, sorted by what actually sets them. Each guide starts with the care label and the one mistake that turns a spot into a permanent mark.
9 guidesUpholstery, Floor & Surface Stains
Stains on things you cannot throw in the wash: sofas, car seats, hardwood, stone, vinyl, glass and electronics. The method changes with the material, so every guide names it first.
7 guidesKitchen & Bathroom Cleaning
Built-up grease, burnt-on spills, soap scum and bathroom growth, plus the chemical-safety rules that matter when you reach for a stronger cleaner.