Hi, I hope someone knows the answer to this one.
I have a NEFF integrated dishwasher - S5443XGB/38 approx 7 yers old. Until recently has worked perfectly. Suddenly the dishes in the top rack are not being rinsed properly. A milky, slimy residue is left on them also they feel as if they have food debris stuck to them. The dishes in the bottom rack are washed perfectly.
I have checked nothing is blocked and that the spray arm is clean and able to rotate.
I have run through the machine a diswasher cleaner product but this has made no difference.
I have not changed the dishwasher tablet that I use.
Any help would be appreciated.