You might have already put in your quote, but if this is of interest, you can always use it as an excuse to follow up and offer something different.
Most churches dont allow drinks in the sanctuary, but some do, or they have areas that, almost as soon as they are cleaned, they are dirtied up again.
I like to offer them a price based on coming in several times per year (one place we do weekly) and mop up the areas that need it. Almost like a preventative maintenance plan.
Why might they accept this?
Well, they are keeping their location clean right through the year rather than just once, occasionally, for a few months (at best). They are also smoothing out their cash flow (which if you are dealing with the treasurer, will be huge)
Why might you do this?
You can command a higher annual price for the work (billed monthly)
You spend less time at the location which allows you to book work around it
Folks at the church see you, get to know you and start calling and referring you.
Just my thoughts, good luck