The best advice, as always, is to stop the bigger bits getting into the plenum in the first place.
Either buy Jules plastic plenum guards, or fit some 'gutter guard' plastic mesh material. All that is needed is the gaps at each side of the plenum (by the bonnet hinges), suitably filled in such that water can go down, but not leaves, twigs, paper and other debris.
Add the plenum spyhole mod, then you can easily check the drains are clear.
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Harry
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