My wifes driving me mad complaining about soap still left in washing after cycle has finished.she has to put it on two more rinses to clear the soap from the clothes.The machine is a Zanussi aquacycle XC6 1400 spin.Its 2 yrs old with 5 yr cover, so we\\\'ve had the engineers out 8 or 9 times and they say it does appear to be soaping up more than it should but cant find a technical fault so they cant fix it. We are using a very small amount of powder. Any ideas please?