[EandM]

First of all set a proper minimum price of £10, don't mess about with 6 or 7 quid!! I give all my customers the option of monthly or every other, and the really big houses I'm happy for every 3 months or even 4 monthly if its a big enough house!! I actually prefer every other month these days 

I'd endorse this too. In twenty plus years I've never bothered with fractions. Minimum clean was £5 then and at least £10 now. Everything else runs in increments of £5 to equal nice round numbers. Easier to remember, add up etc.
Appreciate it's all down to your area and competition but seems to work in the South West.

[Paul Coleman]

I do feel that a lower frequency should be met with a higher price.  My own experience is that if you have compact work and supply a less frequent service, it can spread like a disease.  The antidote to this is a higher price.  That way, if others do follow her, at least you have decent priced work.

[groundhog]

Another advantage of every other month is that you can cram more customers into your round, which means that if one of them cancelled it only has half the impact than if all your customers were on monthly!!