I think it depends on the distance. If they live in a different country or at the other end of this one, you could invite them to stay for a few days next time you have a holiday, or if they are a few hours' drive, organise a visit at the weekend to do something like if they were relatives.

And the payback for washing up and travelling is seeing your friends, so really "would you like me to visit sometime" is a perfectly acceptable opening line.