With the suggestions so far I had some good leads on where to start my search for a good bottle brush for hose cleaning. I already knew the baby-bottle brushes were too short. So, this afternoon I dragged my rear out of my armchair and downtown I went on a three hour tour. The weather started getting rough.....
First I started at Big-5 to follow up on Luis' idea. I found the hydration bag brushes and they looked pretty good to go for the job, but I decided to shop around some. I also found some 12 gauge nylon-bristled bore brushes, but not the 10 gauge I was hoping to find. I think even 10 gauge would be too small for what I wanted.
So, I went to Wal-Mart to basically walk every isle of every pertinent department to see what I could find. I found basically the same hydration bag brush, but cheaper. Good move from the get-go.
Then I spotted something which I thought might work in the pet supplies area. They were long bottle-type brushes in the aquarium section, but they were WAY too soft. I guess they are for the soft, flexible vinyl aquarium tubing.
Then I spotted it- My hose brush. It was in the kitchen cleaning section next to the mops. It is called a "Reach & Sweep" by Range Kleen (
www.rangekleen.com). It is about 26 1/2" long with the handle. The first 3 1/2" of (plastic/nylon? bristled) brush is 3/4" in diameter, and the next brush section is about 8 1/2" long at 1 1/2" diameter. Perfect! The rest is a wooden handle (I guess). It is made for cleaning refrigerator coils, just like "standingup" suggested.
I found that the 3/4" diameter section interfered when I was using it on a hose. I decided to cut it off (so now it is 23" long overall). If you get one of these and try this, be forewarned- the bristles will start to cascade out from between the wires because as some bristles fall out it leaves more room for the ones next to them to fall out, and so on. Using a couple pairs of pliers I twised the ends of the wires tight again and reinstalled the plastic end cap on them.
Anyhow, the brush cost $3.44 before tax. So, pick one up, fill a washbasin with sudsy water, pull up your favorite armchair, and brush all that mildew and gunk from your hoses. Turns out, mine were pretty clean and the aforementioned white spots are still there. Maybe they're just "age spots"
Thanks again for the leads, folks.