Couldn't find the string in the archives for you about keeping the sprayer unclogged - but in the past, there were some good suggestions.
One I of the suggestions I took up was to buy a very cheap little
plastic spray bottle holding about 50 mls which wears a plastic cap.
After use, fill the cap with water, invert the bottle and press the
cap on tightly. I last used my Pripps flux 3 weeks ago - and just
tried it - worked immediately. – – John Burgess;
@John_Burgess2 of Mapua Nelson NZ