My Event jacket suggests two dots and steam.
Wash in reproofing is easier to use than spray on but it also coats the inside of the jacket which stops most breathability for the first few wears until it wears off.
Also - it's not 'reproofing'. Gore-tex is waterproof because of a waterproof membrane inside the jacket. The outer layer of the jacket is not waterproof, but it needs a water repellent coating to stop it soaking up water. This coating (DWR) is what you need to replenish. If you don't, your jacket is still waterproof, but it won't feel like it because it'll get cold where the sodden fabric is touching your body, and it won't be breathable becaues the sweat vapour can't get out through waterlogged fabric. So it feels cold and wet, but it's not leaking.
I just did 5 garments using both Graingers and Nikwax spray on. Graingers was less smelly, less sticky and nicer to use.