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Maybe you changed your technique a little last time. Quite often the top frame of the openers is caked in dirt, so you either have to clean it every time or always avoid it. Possibly you've started to clean above it and dragged the dirt down?
use plenty of water on the 1st clean on frames. also charge more money for the first 3 cleans, then drop to what every your daily rate should be as from there on it is a doddle