hi there
make sure that you offer a professional service,
when you call them get the name of the decision maker.
when you are asking the questions ask when their contract is up for remewal,
then contact them 3 months before the renewal date, cause some cleaning companies have an auto renewing contract if the client does not terminate the contract 3 months before the anniversary of the contract.
it is a dodgy clause but believe me, it works, client retention due to contract terms.
so then when they are reviewing their contract you can quote.
one method is when you ask when the contract is up if it is say in March, ask them if they know how much notice they have to give, nine times out of ten they will then check.
there are a lot of companies with this renewal term, be aware of it.
regards
martin