Carpet cleaning...then bought the window round in the streets where I live off previous cleaner....am loving doing both although can be a bind on a 50/50 day......got wfp and now do Upvc cleans and gutter vac for gutter clearing.....the windows is taking off due to mentioning it to carpet clean customers and vice versa....slashed the ad budget by 65%.....customers do not see it as jack of all trades they see it as someone who does a good job at one thing so is probably good at others especially if they see you have splashed out on decent gear....also a good trust and reliability thing.