Maybe wait till after Christmas has been paid for then try again. Don't be afraid of leaving your comfy regular wage, running your own full time business boosts your confidence, pride, income (if your not on a fantastic wage now), and flexibility during working hours. Maybe that flexibility might mean in future you'll be able to take time out to drop off/pick up from nursery or any of the other many things that take up time during the day with a child.
I'd think very carefully before selling the equipment off. You will get work even with all those other cleaners around if you canvass without giving up. As said, they won't all be great at the job, maybe you will ?
You'll probably hear plenty of people trying to knock you down too - " a window cleaner, really, I wouldn't do that for a living " OR " most people already have a window cleaner " OR " you'd be mad to give up your job "
These are usually work colleagues or relatives who don't have the ambition that you clearly have.