I gave mine a good hit with compressed air.
Sadly the ports are rather small on the head, and it dosent take much build up to restrict flow. Getting the crumbs out is probably more important than getting some distilled water out.
Last flush I did, I refilled it with distilled water, and left the lower radiator hose off , ran it till hot, then gave it 3500rpm till it blew off under pressure.
The blast spat crumbs out everywhere.
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