Very nice site, you can do one for me if you like.
I agree with Andrews comments on the pricing market, Unless you work in the rain, I would be carefull on offering a 12 cleans in advance contract,
If someone pays 12 months in advance then written contracts must be in place, and if you can't live up to your end of the bargain,due to bad weather, you can leave your self wide open for the compensation searchers.
Add the clause in your contract regarding the weather.
and if your wfp and work in the rain, I'll just crawl back into my computer and hide.
By the way good luck with your new venture, there are loads of great guy's and gals on here who are always willing to help.