Removing visible aphids is one part of managing an infestation. Follow-up inspection matters because a quick glance at the most obvious colony can miss insects elsewhere on the plant.
Confirm the pest and examine new shoots, leaf undersides and neighbouring plants. Keep an affected houseplant separate where practical while you assess the extent of the problem.
Record what you remove
Physical removal may be suitable for a small, accessible infestation. Choose an approach the plant can tolerate and avoid damaging tender growth while trying to clean it.
Mark the inspection date and check the same places again. A photograph of the affected shoots helps you see whether numbers are increasing or decreasing. Old distortion may remain after the insects are gone, so inspect the insects themselves as well as the leaves.
Do not improvise a concentrated household spray because one treatment did not finish the job. If further treatment is needed, use advice and products appropriate to the identified pest, plant and local rules. A manageable inspection routine is more useful than repeated applications with no record of what was used.
The RHS aphid guide identifies shoot tips, flower buds and young leaf undersides as common colony sites, and recommends frequent checks. Return to those areas after removal rather than judging success only from an old curled leaf.
Related reading: Aphids on Houseplants: Inspection, Removal and Follow-Up.