The dishwasher has a small cup in the corner

Got it! You’re referring to the small cup inside a dishwasher, usually located in a corner — that’s typically the rinse aid dispenser or sometimes a pre-wash detergent cup depending on the model.

What’s the small cup for?
Rinse Aid Dispenser: Holds rinse aid liquid, which helps dishes dry faster and prevents water spots. You refill it regularly.

Pre-wash Cup: Some dishwashers have a small compartment for pre-wash detergent to be released early in the cycle.

Tips:
Always keep the rinse aid filled for best drying results.

Use the right product for your dishwasher.

Check your dishwasher manual to confirm which cup is which on your model.

If you want, I can help you figure out exactly how to use or refill it!