The first thing to do is to read the product label instructions and the garment care label instructions carefully. Some kinds of fabric may get damaged by stain removers, so you cannot be careful enough.

To make your laundry whiter, it is best to prewash them. Wash them as usual and then soak them in the stain remover. After a few minutes, rinse them with water. Avoid using the stain remover in every wash and do not soak for too long.