My advice is when quoting to break the quote down.
For instance after our preamble chat, measuring up, checking for good drainage etc i say something like "Price to clean the block paving driveway is bla bla. " (I go in high)
Then say before giving a price to resand "do you want me/us to come back and resand it for you or are you going to do it yourselves?"
Either way you get a good price for the clean before committing yourself price wise to others add-ons. Not only that the customer will normally decide to ask "how much to resand" or just say "we will do it ourselves and not bother asking."
Giving the customer the options is a good passive way of up selling any add-ons and to gain a higher price for the initial clean.
Works well for me