Aphids are an absolute pain, they get everywhere. Just tried a fairy liquid rub on my chilli plants grown on kitchen window sill and it appears to have worked. I used a diluted soapy coating on my hands and delicately rubbed stalks from base to top ensuring each leaf is completely covered. Also used a diluted fairy water wash to rinse afterwards. Scooped up many dead aphids from the pot so some success. Not sure if this process will damage my plants but will try anything that is not insecticide.