Fabric softener sheets are typically designed to be used in automatic washing machines, where they are added to the dryer along with the clothes. They are not intended to be used directly in hand washing or placed inside the washer while hand washing garments.
Using fabric softener sheets in a washing machine is generally safe because they are designed to disperse in the dryer and leave a thin layer of softener on the clothes. However, if you were to use them for hand washing, there is a possibility that the sheets could leave a residue on the clothes, especially if they are not adequately dissolved in water.
Fabric softener sheets are not formulated to dissolve entirely in water like liquid fabric softeners. If used for hand washing, the sheet may not fully dissolve, and some residue could be left on the fabric. This residue might be difficult to rinse out and could cause issues such as reduced absorbency in towels or a greasy feel on clothing.
For hand washing, it is better to use liquid fabric softeners or other appropriate fabric softening products specifically designed for hand washing. These products are meant to be used with water in hand washing situations and are more likely to rinse out completely, leaving your clothes soft and fresh without any unwanted residue.
Always follow the manufacturer's instructions and guidelines for using fabric softener products, whether in an automatic washing machine or for hand washing, to ensure the best results and to avoid any potential issues with residue buildup.