One of my clients told me that her husband was taught that – "Never let a woman wash your clothes!" Why? Because she can put stuff in your laundry!
You can even work this trick on yourself, whenever your spiritual cleansing, luck, or prosperity need a touch-up.
It's a fine old time-tested method for influencing people, and the easiest way to do it is to put things in the laundry rinse water. A few drops of oil, some bath salts dissolved in water - it's easy.
Especially in This Modern Age, when you can soak a washcloth in it and pop it into the dryer, just like a dryer sheet; or pour it into a Downy Ball, walk away and forget it.