I have been living in a hard water area for 2 years now & am getting a water softener shortly. Every few weeks I descale my kettle & bottle steriliser with citric acid. We have been using limescale tablets a lot of the time (I would say 50%) in the washing machine, but I would like to try to clean out any limescale build-up there may be that I cannot see. Do you think if I put some citric acid into an empty wash it would do the job? Do you think I would do any damage to the machine?