I don't have an issue with any residue left behind. I like these because in the old days, I always measured out way too much detergent and all my glasses got cloudy looking. I don't have that issue any longer. Granted, my dishwasher today is 1000x better compared to years ago. So I'm sure if that plays a part in everything. I use this with the Jet Dry (same company) and my dishes are dry when I take them out. If I only use the dish tab, my dishes are still wet when I open the door. I do not get any water marks as long as my dishes dry (Jet Dry added). If they are still wet then yes, I will get water spots (not using Jet Dry). I pre rinse ALL my dishes (I will never stop doing that no matter what the soap and dishwasher companies say) so, obviously, I don't have any food left behind. I've used this Finish and the one with the gel type pack. They both work well for me. I buy what I can get my hands on. This style is considerably cheaper compared to their gel......just sayin'.