That 1 cap can make an “all-purpose” cleaner of 500 to 750 ml (water)?
So from 1 bottle of Thieves® Household Cleaner, you get about 32 bottles of detergent for about €0.83 each….
If you want to make a stronger cleaning product, you can always add more Thieves® Household Cleaner to the water.
So: Clean and cheap!