We all have had a build up of deposits in the maserator and head hoses, I beat it buy using cleaning vinegar. Just a few spoons each night and the problem of build up and eventual clogging is a thing of the past. I buy 'cleaning vinegar' from hardware stores when I can as it's much cheaper than 'table white vinegar' from the supermarket and works as well. I guess there won't be a lot of replies but hopefully this thought will get read and tried. Nothing worse than having to dismantle the head and scrape the deposits out.