If you clean carpets, you must be in 10 - 20 houses per week, all of whom will have seating. If you want to know about the opportunities that exist in cleaning leather upholstery, all you have to do, is talk to the customers with leather suites, which nowadays, is about one, in three.
But.....you said you hate cleaning suites, so why not stick to what you presumably like and market your carpet cleaning, more aggressively.
It's easy to get sucked in by what other people are doing, or appear to be doing and take your focus off your main business, or what you've proven to be good at.