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I stopped using the default "eco" program and switched to the faster "auto" program on my dishwasher since watching this video on how these programs actually work:

https://www.youtube.com/watch?v=_rBO8neWw04

TLDwatch: eco programs use only one batch of water, others use two and that results in cleaner dishes with the added benefit of a faster program.

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I am secretly convinced they have "eco" programs just to get the A+++ rating on energy efficiency, but that you're not really meant to use those modes.

That's not a secret, that's exactly why they do it.

I feel like I read that in the manual that comes with my dishwasher. It was worded a bit differently, but it essentially said to use auto mode to get cleaner dishes, not eco which saves money but doesn't clean as well.

That's going to depend on your dishwasher. Our dishwasher does a prewash even in eco mode. But the water won't get as hot (to save power) and it takes longer. On the other hand, the 30 minute mode only does the one main wash. Check your manual.

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