After precipitation & centrifugation use a pipet to remove the ethanol, then add a second short centrifugation step to concentrate the remaining ethanol from the vial walls at the bottom of the vial and use again a pipet but be careful not to transfer the pellet.
I don't know if you might be doing this already but after the initial removal of ethanol, it might help to run another centrifugation step to ensure anything further drops to the bottom of your tube. I find that is most often the culprit, a drop somewhere not near the pellet that I couldn't see. Depending on what use we are talking about, maybe it's also reasonable to allow the pellets to dry in a fume cupboard?
According to the routine kits instruction, ethanol removes when you do gentrification.
If ethanol remains in the tube it makes some problems when working with enzymes such as polymeases.
the above answers are good. Do not be tempted to heat the samples to evaporate off the last of the alcohol. If the dna dries too much it becomes very difficult to dissolve properly again
Keep it at room temperature for overnight. then add TE Buffer and incubate at 55 degree for half an hour.
I am doing this for genomic DNA
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