This product contains animal urines which act as a repellent by creating a "danger zone" to smaller animals that fear that they might get eaten. Simply apply it by sprinkling it along and around areas that you want to creat the "zone" around. It works on some animals and not others. The determining factor is whether the animal you are trying to repel is scared of the predator scent. That is what works, nothing else. If the animal is not scared of the scent, then you have to resort to other tactics such as baiting, trapping, etc.
It should have no effect on clothes when applied properly. The scent usually lasts 1-2 weeks.