Welcome to the forum – I use soapy water and then just keep taking them off by hand – apparently planting alliums like onion or garlic discourages them bu t i’ve never tried this method myself so can’t vouch for it.
Where do you grow the chillis and do you have any pictures?
All the best
Well hopefully you can wash them off in the bath – if the fruits are developed enough (which they seem to be from the pictures).
To keep them away maybe try pointing a fan on them. I really really hate aphids and I love ladybirds!!
I think I once read somewhere that dusting the infested areas with flour helps – apparently it constipates the aphids – never tried it myself though.
How are you getting on with the aphid infestation?