Regarding Cleaning Validation

how i calculate ATD or VTD surface area to find out Rinse and Swab value?
i m confuse regarding contact surface area or surface area?
like for vtd, can i consider only cabinet surface area or with tray also?

you can take cabinate surface area, tray area and also plate surface area

Thanks…
as i understand plate surface area means for VTD.
M i right?

Yes…right