Help! I need to de-flea my house and cat!

So the other day, my indoor cat was accidentally left outside, and also today he got out again and now my house and him are full of fleas. I’ve decided to keep him outside for the moment since I am trying to sell my house and do not want more fleas coming in.
However, he is an indoor cat and I would like to have him back in the house as soon as possible. Are there any ways, without flea-bombing my house, to get rid of the fleas that are already in my home and on my cat?