If UK is riding her bike in all kinds of weather the way she describes, she cannot clean the bike without water and cleaner. Too much gunk comes of the road. If she's taking it off pavement, it'll get even dirtier. We're not talking the normal road grime most of us get on our road bikes. Her chain needs more than a wipe down.

Lube on the chainstay, spilled energy drink, chain cleaner, road oil, mud -- it will not come completely clean with a brush and elbow grease and you'll have to be very careful not to scratch your bike with this approach. You have to at least use a very damp rag.

Pro mechanics everywhere recommend it. Here's more. Pro mechanics are known to spend all night washing bikes for the next day's race.
http://www.bikesportmichigan.com/bikes/prevent.shtml

In their instructions, Park Tool shows washing an old school steel Bottecchia. If that bike can handle it, a modern sealed bearing aluminum Specialized can handle it.