We bought our dishwasher in March 2000. I have used HG Service Engineer powder regularly on it, as recommended by an engineer who had come to service the previous dishwasher, which had probably only lasted about 8 or 9 years before it became too clogged to use. He explained that it was necessary to clear out all the debris that accumulated inside it. We replaced our washing machine in June 2013, which had been bought in 1998, also regularly cleaned with this powder. I strongly recommend that you buy this product and use it regularly. It's brilliant!