Hi Jim, on this one I can give you oem preliminary advice.
These will clog if stored for a while. What you can do is fill the unit with hot tap water no hotter than about 140 degrees.
Then also soak the trigger in some hot water as well, you may need to take that off for this process. That shoudl clear up your spraying issue. If you still have any trouble please reply to me anytime for addition help no extra cost.
In any case, I will stick with you until this is complete.
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