Corrosive liquid police found on kitchen surface (6,4)
I believe the answer is:
formic acid
'corrosive liquid' is the definition.
'police found on kitchen surface' is the wordplay.
'police' becomes 'CID' (abbreviation for Criminal Investigation Department).
'found on' means one lot of letters go next to another.
'kitchen surface' becomes 'formica' (hard durable plastic used in kitchens).
'cid' after 'formica' is 'FORMIC ACID'.
(Other definitions for formic acid that I've seen before include "Tannery chemical" , "Substance emitted by some ants" .)