Dreaded Greenfly

Garlic-gub

I brought my chilli and pepper plants in at the end of last year before the frosts.  After a few weeks I noticed small black flies then the green fly.  I had been using a weak solution of washing up liquid but today I lost the battle.  No damage to chilli /  pepper fruit luckily.  Can anyone suggest anything else I could have done before resorting to commercial pesticides etc.?