Maybe I am missing something here. Rugs are an obvious to have to remove to clean properly. But I also add, so are or is upholstery. Especially with leather and other not so easy to clean textiles. Believe me if you offer a pick up, clean and return upholstery service you can charge what most people dont think is possible.
You can also do a much better job as you arent so time restricted. You also have more control over the drying and will almost always be able to add on protection.
The referrals will number greater than just cleaning insitu as the neighbours will want two things, 1) to know what was going on in the first place and 2) to have the same service for their textiles.
What on site would have been say 2 or 300 could now be 4 or 500 pounds to do the same thing. Just remember you arent actually doing the same thing, you have cleaned better and offered a service maybe very rare or maybe even un-heard of.
Shaun, you wanted to know how to be different to increase your income, well here is an idea......
Best, Dave.