Hotpoint FDW70 Dishwasher suddenly has smeary glasses?

FDW70 4years old. Suddenly started producing smeary glasses etc. Used 'Finish' D/W cleaner twice, added salt even tho' in soft water area (Devon), topped up and adjusted rinse aid, checked filters and holes/operation of sprayer arms still no change. It's now beginning to smell musty even though the water pumps away freely. Can't understand the sudden change. Internal blockage? Wife's going bananas. Not a pretty sight. HELP