No suggestions on helping them through, but a suggestion for next time. After washing the sprayer out, put straight household Ammonia in it, slosh it around and spray it through the nozzle. It gets rid of the residue.
If my people, who are called by my name, will humble themselves and pray and seek my face and turn from their wicked ways, then will I hear from heaven and will forgive their sin and will heal their land. 2 Chronicles 7:14
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