Report scale and method as liquid strained (4)
I believe the answer is:
whey
'liquid strained' is the definition.
I don't understand the rest of the clue.
(Other definitions for whey that I've seen before include "11 Across residue" , "Residual liquid from clotted milk" , "Watery remains after the curds are separated in milk" , "Residue from junket" , "Part of 26 Across" .)