Wow! You have got one bodacious infestation! The little sawdust things are shed skins from the aphids. I’m not sure how successful you will be treating this as there are so many but here goes. First, use a fairly strong blast of water from a hose or good spray bottle and try to knock off as much as you can see. They are soft bodied insects and will usually not survive the blast. Let the plant dry out for a few days and then take a spray bottle with a mix of 50 / 50 distilled water and rubbing alcohol. Spray down everything you can see and especially the things you can’t like in the tight stacked leaf areas and let it dry. Give it a wash off with clean water and hope for the best. If you see more appear you may need to repeat the water / alcohol treatment a few times.
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