[flbrewer]

Why not use rubbing alcohol for spot spraying of equipment? Seems cheaper and there is no need to mix a specific ratio for a spray bottle. 

[MDixon]

Because isopropyl alcohol isn't for human consumption, you could use some Vodka. I think StarSan would prove to be one of the least expensive solutions.

[flbrewer]

I use SS, just asking.

[3bbrewing]

While it's an excellent sanitizer, regardless if it's denatured ethyl or isopropyl alcohol, it's very toxic to drink.   However, when applied topically (i.e. on skin before a shot, or as an equipment sanitizer...), it evaporates.  Unfortunately, what is used to denature it does leave behind some undesirable residue in very minute amounts.   

I use it to sanitize the mouth of a flask for yeast starters, cleaning surfaces where I do yeast work, and such, not with with anything that contacts my beer.

[erockrph]

If you wanted to use alcohol, 151 proof spirits would be the ideal choice. Cheap vodka is only 40% alcohol and isn't effective as 70%.

[dzlater]

Everclear   

[a10t2]

Isopropyl alcohol and a flame is what I use to sanitize all my brewing/lab equipment. Cheaper and more effective than chemical sanitizers. The flame is key, though.