The Cheapest, Most Concentrated Eco-Friendly Dishwashing Liquid

Last year I bought a 32-ounce bottle of Biokleen dish soap for $4.79.  It lured me in with its seductive lemon-thyme scent but disappointed me with its lackluster performance in the kitchen.  Dishes came out greasy unless I used a LOT of the stuff, and I am not obsessive about dirt and grime.  I squeezed the last drop out of that bottle in less than six weeks. 

Six weeks for a bigger-than-average bottle?  This is what prompted me to pick up the $1.50 25-ounce bottle of generic, conventional dishwashing liquid.  It lasted from October to February–over 19 weeks!  In that time period, I would have had to buy at least two more bottles of Biokleen–and toss them in the recycling bin when they were empty.
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