Aphids attack hibiscus plant again

After several weeks a small hibiscus flower bloomed, yet again the plant was attacked by ants and aphids with the white aphids covering the stem of the hibiscus plant with a layer of white eggs. It appears that the ants are attracted by the nectar of the hibiscus plant.
Earlier the ants which were spotted on the hibiscus plant were fairly large, now the new ants are quite small. A knife or similar tool will be needed to remove these ants and aphids from the hibiscus plant or no more flowers will blossom on the hibiscus plant.
Orange oil was recommended online, however when rotting oranges were placed near the base of the hibiscus plant, there was no effect on the ant attack, it continued.
Other suggestions to remove the aphids and ants from the hibiscus plant will be appreciated