If you believe that you, and only you, can clean your customers to an acceptable standard then your business will always be limited to what you can personally do. Granted, you might get faster and more efficient over time, but there is still a physical limit to what just one person can do.
I've seen a lot of window cleaners who chase perfection at every single job, and this is just not scalable. The standard to aim for is the minimum possible that the customer will accept. If you go above and beyond this standard, it will take longer (and therefore cost more) for no additional benefit.
Every time I take on new work, in the back of my mind I'm continually making sure that the job is scalable. That there are no aspects of the work that an employee couldn't do. So no crazy, back-breaking pole acrobatics to reach an awkward window, no climbing over gates, no walking on roofs etc. Anything like that just doesn't get done.
My work is highly priced, at least 1/3 more expensive than other window cleaners in our area, but if any job is not scalable it is of no use to me, no matter how amazing the price may be.
I don't want to be working on the tools when I'm 70 or 60 or even 50. I also don't want to stop growing because I've reached the limit of what I personally can do, and that means developing a customer base and a system of working that is completely transferable to employees. It cannot require such a standard of perfection or experience that it depends on me personally doing the work.
If you are chasing a level of perfection that only you can ever achieve, and don't think you could ever trust employees to be trained to do it, then sorry, but you do not own a business. You own a job.