Can't see the pictures, but sounds like sucking pests. If you see stipling or marks on the leaves like it has been scratched and the leaf looks dry, it could be mites. Mites and most sucking insects will be on the underside of the leaf and on the stems. You may need a magnifying glass to see them.
If the buckets can be moved, move them to the shade after you give the plant a thorough jetting of water paying attention to the bottom of the leaves. In the shade, hit it with horticultural oil, paying attention to thorough coverage of the undersides of the leaves and the stems. This will smother aphids, mites, thrips. However, it will not take care of any eggs. You can move the plant out after the sun goes down. You will probably have to repeat every 3 days or so.
If the plant is large but otherwise healthy, you can cut it back firstand remove most of the leaves. Bag everything and dispose of it in the trash. Then spray. I find it easier with a heavy infestation to physically remove the pests on the leaves rather than try to save the leaves and cut back the plant so there is less to treat and it is easier to monitor. The new leaves should come out healthy, you just have to make sure that they don't get reinfested. Try to change the location of the plant or if you cannot, then make sure you treat everything around it. Aphids, mites, thrips have multiple hosts so if you don't want the bugs to come back, you have to do an area treatment rather than a spot treatment. Thrips and mites are the worst in warm dusty weather, keeping everything well watered, including jetting the dust off the leaves of plants helps to knock the pests off. Usually the problems go away after a good hard rain.
Happy gardening in Hawaii. Gardens are where people grow.