Allergies From Washing Powders - eHow- daz washing powder washing soap brands washing powders allergic reaction ,Jul 14, 2020·A person who reacts to chemicals and fragrances in laundry detergents likely has a weakened immune system. She may develop more tolerance for these substances by taking antihistamines or getting allergy shots. Considerations. People who have washing powder or washing powder allergies should switch to more hypoallergenic brands of detergents.