Stain Removal Techniques
Old stains are more stubborn than new ones, and vintage fabric is less forgiving of aggressive treatment. Slow and gentle beats fast and harsh almost every time here.
Blot, don't rub. Rubbing pushes a stain deeper into the fibers and can damage delicate weaves in the process. Work from the outside of the stain inward so you're not spreading it wider.
For protein-based stains, blood, sweat, food, always start with cold water. Hot water sets these stains permanently by cooking the proteins into the fabric.
For grease and oil stains, a small amount of dish soap worked in gently before washing is usually more effective than most commercial stain removers, and gentler on old fabric.
Old yellowing on white or light fabric can sometimes be treated with hydrogen peroxide, but test it on a hidden seam first. Some vintage dyes react badly and you won't know until it's too late to undo.
Never combine bleach and ammonia-based cleaners, together they produce toxic fumes. This matters more than any stain does.
When a stain is on something genuinely rare or irreplaceable, it's worth taking to a professional before trying anything yourself. Some damage only happens once.