What is the most crucial rule to follow for effective stain removal?

The most crucial rule to follow for effective stain removal is to treat the stain immediately. This is because fresh stains are much easier to remove than those that have set in. When a stain occurs, it begins to bond with the fabric fibers, making it more challenging to eliminate as time passes. By acting quickly, you can prevent the stain from fully penetrating the material, thereby increasing the likelihood of successful removal with appropriate cleaning methods.

Immediate treatment often involves blotting the stain to absorb excess liquid and applying a suitable stain remover. Delaying the process, as advised in the other options, can lead to a more permanent mark that requires harsher chemicals or multiple wash cycles to address, if it can be removed at all. Thus, addressing stains without delay is essential to preserving the integrity and appearance of the fabric.