Have been told that my tank has water in it and have been advised to put 1/2 ltr of metho in my next fuel tank to rid the water,I have heard of this,I think it was even a thread on here. but i just want to ask again if this is the correct (harmless for engine) thing to do. Is 1/2 a ltr the right amount and is it just ordinary metho i'd be using? Thanks for any info. Adam.