Apparently pre-rinsing confuses the dishwasher or something. Not doing it leaves me with residue all over the other dishes though 🤷
fill the given soap cup all the way
One thing I've learnt from this thread is that this isn't necessarily right. Its size allows for people with hard water, but if your water is soft then by filling it all rhe way you are likely using too much, which can lead to residue on your dishes. For soft water, half filling is apparently often plenty. Which is another reason to use powder not pods.