Basically all of the above works and works well...biggest thing is you do it. I personally don't detect odor after a day or two. I'll admit with many trips, I may not know I am going 2-3 weeks before, and when I do, busy getting things with work, family, workouts and shooting where spraying is usually a more last minute affair. (by last minute, a day or three before I depart)
You NEED to allow time for the clothes to dry completely is the biggest thing. I typically try and spray clothing outside if weather allows, and then on the shady side of my house I have a fence I can hang things on while spraying, then flip sides and spray the other. I will initially leave outside in case of any drips, but within couple hours (earlier if windy) ill bring into the garage and hang on the misses squat rack/pull up bar (she loves it when I do this).
I used the same for an extended backpacking trip on an extended version of the John Muir Trail and some side travels, wore the same sun shirt, shorts and socks pretty much every day for over two weeks, and typically jumped into a mountain lake at least once a day, initially clothed but would work my way down from there, washing out what sweat, grit, salt, etc. before laying all clothes out into the sun to dry. So didn't wash with soap, but the items went through many, many lake washings and were still effective even on my next trip the following month in the Cascades on mosquitos.
If you will have three or four changes of clothes, so you are not having everything washed 12+ times, you should prove golden for your trip. I spray everything, and really soak key areas on your pants, socks, and waistlines where ticks love to try and nuzzle in.