For quite a few years, I have been doing my own laundry and would go off of what the information on the side of the bottles would indicate. The liquid detergent I usually purchase would suggest using X amount of the accompanying cap which comes with the bottle. So when doing my weekly washes, I would *glub glub* fill up the cap and do my wash. Years go by and my laundry will at times feel a bit… interesting. There were times when the cloth would be just a tad bit weird, but I did not think anything more on it.
Just a few weeks ago, I looked something up online and found a website stating that for larger loads you only need two tablespoons worth of liquid laundry. Say what? Of course, they want you to use a large cup of the stuff because then you go through it faster and need to purchase more. Now I have learned the secret and am passing it along!