How should I apply this 72% laundry soap bar to effectively whiten dull white fabrics?

This product is a solid laundry soap bar designed specifically for textile use, not for skin. The "72%" indicates a high soap content, which helps lift built-up soil and residues that cause pale fabrics to look greyish or yellowed. Because it is a solid bar, it allows for targeted spot application rather than dispersing the product throughout the entire wash cycle. This makes it particularly practical for treating areas that lose their fresh look faster, such as collars, cuffs, socks, and kitchen textiles.

To use it effectively, rub the bar directly onto the fabric where extra attention is needed. This method is ideal for pre-treating stains or refreshing items that have lost brightness before hand-washing or machine washing. The soap loosens dirt and washing deposits from the fibres, while whitening components help revive the visual clarity of the material. For best results, follow the garment's specific washing instructions after application.

It is generally best suited for sturdier materials such as cotton, linen, and some synthetic blends. If you are washing by hand, ensure you rinse the fabric thoroughly after using the soap to remove any residue. Always test the soap on a small, hidden area of the fabric first to check for any adverse reactions, and keep the bar away from children.