Dazmond, Sounds like you have a good work ethic, esp like your 'price high work harder' motto.
Imagine if the most popular foreign car wash in your area decided to ask all the customers they had if they wanted their windows cleaned for the same price. And then offered that to everyone in town. Tbh they do an awesome job, and I don't think people have the same trust issues they had before about foreigners.
I think that by really looking after your existing customers tho, your business will continue to expand even if there is alot of competition just thru referals and reputation.
I think I might offer a discount on 'insides' the months before the cold weather in future, book it all in for when it's hard to work outside. That and gutters should boost the cash flo somewhat.