You should have no intake of sucrose in your diet...
And I can vouch for the coke in the trunks of state patrol cars... I've been to accident scenes (I'm a volunteer medic afterall
) and I've seen the cops cleaning the road. We don't have to use coke to get it off our clothes though, because our gloves are disposable and our over-alls are cleaned using a special process.
Blood is actually very hard to rid of. Solid pieces or chunks of flesh can be picked up or swiped away, but the blood goes between the smaller parts of the asphalt. Water dilutes it and doesn't remove the "stain." When water is used it is usually to blow away any solid parts and as much of the blood as possible, but the stain will stick until you clean it out. In the ER and hospitals they have detergents made for that purpose, but on the highway coke is used: it is extremely cheap and it works wonders.