as a building manager in high rise tower, he wanted to email building cleaning sub committee to arrange a meeting to review the scope of cleaning? how should he email them so they can understand his concern and help him out to sort out the scope of cleaning issue.

issue is- contractor is cleaning as per the scope but overall committee is wanted to get more things done which is not acceptable by the contractor? he is doing it now as per the builder manager request as a favour but while doing that so he is running out of time to carry out actual scope of cleaning work so, building manager wanted to let committee know that contractor is doing the job as per the scope of cleaning but if you want to carry out some extra job then there will be a extra cost. explain things in a nice way so committee can understand.