We have so many ants.
We are in a rental so I am not too bothered about doing a major ant fumegation, but we have so many outside and trailing thru the house - they are now spreading and I found them today busy in our bathroom rubbish bin!!

Whats the best thing to get rid of them? Currently we just spray them with surface cleaner, but they come and go from all little gaps around the house - we need a better treatment.