if a customer on my estate work wants to go 8 weekly then of course the price should go up a bit!why not?you WILL use a bit more water that COSTS YOU money to produce.a little bit of extra time to clean and you have to rejig your round that week to fit them in.
if they moan about extra charge i always point out that they will save money over the course of the year.if they are still not happy they can get lost!they cant afford a window cleaner!!
im not cleaning windows to just GET BY and scratch a living together.im running a profitable lifestyle business that allows me to earn well without having to work every day!

new work in other areas i offer 8 weekly as a standard frequency esp on larger jobs as i can charge more.
my attitude to my business over the last few years has changed dramatically for the better and consequently im earning a lot more money.
i always provide the best quality clean and service i can and i want to make money while im doing it so yep for me longer frequencies mean higher clean price for the job.
best wishes to you all
dazmond