Doug,
AquaHot nozzles are easily cleaned, but a professional service technician will not clean them due to the added expense to the owner. If you are paying someone in the neighborhood of $110 to $125 an hour to work on your AquaHot, a new nozzle is much cheaper than the cost in time charges to clean the old one, and occasionally the cleaned nozzle does not work well leading to more time charges. However, if you are servicing the unit yourself, by all means clean the nozzle, but you will have to buy a new one occasionally though not often.
Gerald