What is effectiveness of methyl-alcohol as sporicide?
Methanol (methyl alcohol) tends to lack sporicidal activity on its own. However, fresh mixtures of methanol and hypochlorite, with at least 15% methanol, are known to have low sporicidal activity.

With an increasing methanol concentration, right up to about 50% methanol, the sporicidal activity can be increased. The preparation, however, isn't overly stable and the sporicidal activity will start to decrease after 8 hours. It is thus recommended, should a methanol + hypchlorite mix be used to counteract spores, to only use a freshly prepared solution of 50% methanol and a sufficient amount of (sodium) hypochlorite that provides 2000 parts per million available chlorine in distilled water and allow for a contact time of at least 15 minutes.

Sources:  


Russell 1990 - Bacterial Spores and Chemical Sporicidal Agents 
Kelsey JC, Mackinnon IH, Maurer IM Sporicidal activity of hospital
    disinfectants Journal of Clinical Pathology 1974;27:632-638.