I actually agree with the sentiment, having lots of bodies on different prices is crazy.
Its a bit different from a single enquiry, you are inviting 'quotes' from lots of experienced CC, geographically prices are bound to differ, for instance you could not afford me
You should set the price for example; £XXXX per hour or day or per cabin, simple as that...As i understand you are very experienced in this type of work so you would know what to expect, both in terms of price and the time spent per cabin.
You will get plenty apply, should be a bit of fun, unless cleaners find out they are working along somebody else on more money for the same work