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Alchohols 80%-90%
Formaldehyde
Glutaraldehyde


ALCOHOLS
Eythl and isopropyl are much more effective as antiseptics than as disinfectants. Disinfectants can act only as long as they are in solution, and means that the alcohols become ineffectual as soon as they evaporate. Although this property has the advantage of leaving no residue on treated surfaces, it often makes repeated applications desirable in order to get adequate exposure.

FORMALDEHYDE
Aqueous solutions are know as formalin. When purchased commercially formalin is a solution of approximately 40% formaldehyde in water. Therefore, 8% formaldehyde in 20% formaline. This high concentration is a high-level germicide, and its activity is further increased by adding alcohol. A combination of 8% formaldehyde and 70% isopropyl alcohol is rapidly bactericidal and even a sporicide. Sterility can be expected within 3 hours exposure. Its tuberculocidal action is extremely rapid. The irritating fumes of formaldehyde limit its usefulness (also its carcinogenic propertys ) and also its toxicity for tissue requires that instruments be rinsed thoroughly before use.

GLUTARALDEHYDE
The chemical relative of fomaldehyde appears to be somewhat more effective than formaldehyde in that a 2% aqueous alkaline concentration has been reported as the approximate equivalent of 8% formaldehyde in alcohol. It is a high level disinfectant. Spores are destroyed within 3 hours and tuberculocidal (kills the living for of the bacteria) within a few minutes. It is also the liquid of choice for lensed instruments and certain critical items which should be sterile when used.

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Hi !
For anyone who doesn't know : 70% isopropyl is much more effective than 100%
So don't waste your alcohol!

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why is it more effective?

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effective
adj 1: producing or capable of producing an intended result or having a striking effect

More effective then would be the ability to produce this result more efficiently or with less work and/or better results than normal sterilization technique 

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More effective then would be the ability to produce this result more efficiently or with less work and/or better results than normal sterilization technique

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70% has more power than the 91% alcohol. The lower water content helps bacteria bring up their protective endosperm faster. 70% has even more water so it slows down the protective barrier from being raised, giving alcohol more time to kill it.

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Nigga Wha? Speak some English foo.
70% does not have more power than 90% at least not per part. Do a test, on different occasions drink some of each and tell me which one u get sicker from 
The higher water content makes some what sense, but could u explain it more in depth. The way I look at it is the more diluted the alcohol is the less alcohol is touching a particular bacteria at a certain time. As in if it was 100% water 100% of the surface of the bacteria is covered in water, as with 70% alc. 70% of the surface is coverd in alc. This seems like a lesser dose for the bacteria to handle then would be 91/99%. Obviously, this isnt really corect, so can you explain?