A strainer in a dream represents a noble servant. (Also see Sieve)
Dream dictionary: Strainer dream meanings
You will have to prevail your reasoning to defend your proposal.
(Bolter | Colander | Filter | Separate | Sift | Sort | Strainer) In a dream, a sieve represents knowledge, discerning, honor, rank and discriminating between truth and false. A sieve in a dream is like a detector of true banknotes from counterfeit, a person who chooses his words, a choosy person of the type of work he does, or a discriminating buyer, a pious person, or it could represent a comb. If a sieve is given as a collateral, or as a promissory note in a dream, it means that the depositor will flunk his promise, for a sieve does not retain water. (Also see Bolter | Strainer)