methyl hydrate is methanol, it's safe to use as washer fluid. Though I wouldn't spray more than a 50/50 mix with water, because the chance of paint or other damage (fire hazard).
Methanol is what's already in blue washer fluid as an anti-freeze, I personally use -20 degree washer fluid for my water spray (which has a close to 50/50 mix).
Methanol is what's already in blue washer fluid as an anti-freeze, I personally use -20 degree washer fluid for my water spray (which has a close to 50/50 mix).