Hey guys, your mostly right, I usually can get the entire garage closed. For allowing us complete closure, we give a discount. ( Money that we would save vs level by level.
However, this is usually how we do it.
We close all the top floors and leave just the first floor open for for the disable on Saturday. Then, on Sunday, we close the entire garage for a day to clean the first floor. This first floor usually takes just as long as 4 top floors combined. The filter is full by this time with over 100 to 300 gallons of class 2 hazardous waste and sludge. ( Garages that we clean on a regular cleaning is far less, (though the cleaning is done to the same standards ). In fact sometimes we have to haul it off in separate 50 gallon drums ( in different trucks) due to the restrictions for transporting of class II waste on the city roads and highways.