I never buy the 2 Pak of NikWax out west treatment.
Always buy the detergent solo and buy the spray on repellent rather than the wash-in version. Like someone said above; extra rinse cycle on the cleaner is key. Then I hang the garment; use the spray on the outer fabric. Using a damp paper towel or rag to ensure even coating and wipe excessive. After it’s hung for a while and absorbed I’ll turn them inside out and tumble dry them on lower heat.