Many years ago, probably like 35 or 40 years ago, I had a kilo of Columbian Red Bud. I took half a K and bagged it for sale and tossed the rest of it into the washing machine cause I was in a hurry to go somewhere.
When I came home, I found the wife doing a load of laundry.
when asked what she did with the pot, she says "What pot?"
I immediately tossed open the washing machine door and started tossing out cloths until I found the huge, heavy, soggy bag of pot. I now had like 5 lbs of wet pot with suds.
I rinsed it off, put it in a cardboard box and set it in the yard to dry. Once it was dry enough to smoke, I tried it out and it was GREAT! I mean it was a whole lot better then the original cured red bud was and I increased the amount of pot that I had form a half a kilo or so to almost a kilo with the weight of the water.
I offered both the original cured pot or the wetter yet stronger pot and almost always people wanted the wetter pot.
My conclusion at that time was that the water and detergents washed out the almost narcotic high of the dry pot that would wipe you out and put you to sleep into a pot that made you very high but you wanted to do things on. I think it washed out the cannabinol as it is water soluble and left the THC which is not water soluble.
I have tried this experiment several times after this when I had pot that would make you more tired then high. It seems to really work for that, but now, in my old age and in chronic pain I have grown to like the knock out punch of the Cannabinol/THC combo and I now look for that type of product.
I don't know how much the washing detergent has to do with the final product, but I never used it when I would "wash" my pot.