Bill, care to share what you have discovered about nozzle clogs and how to prevent them?
EDIT: I should have said regular old paper towels like you buy in bundles of 6 at the supermarket. Bounty, etc. To add a professional touch you can use the more or less lint-free blue paper towels made by Scott available in the painting section at Lowe's.
Most of the clogs I was getting were from dirt accumulating on the carriage mechanism near the heads. Or that's my working model. Sooner or later enough canvas dust, house dust, and ink would make a potent putty that would break off and start frolicking on the nozzles. The symptom of this is the type of clog is that suddenly several patches on the top row of the "Auto" patches will drop out, and sometimes even move around between colors on subsequent cleaning cycles. Very expensive to clear this type of clog using normal cleaning cycles.
The solution for me was to get very pro-actively preventive about this. To simplify, about every 300 square feet with the machine off I work a moist (but not dripping), triply folded paper towel down into the media path, then drag the heads over it once or twice. Move the paper towel down 1.5 inches, a couple more drags. You get about 4 bidirectional drags per towel. Repeat for two or three paper towels or until not much changes between swipes.
That's it, I almost never have clogs, the machine comes up and I print a test pattern and 9 days out of ten just works great, and on the tenth day maybe one cleaning cycle. Have not had a multi-sheet, knock-down, drag-out, hair-pulling, epithet-screaming cleaning battle since I started doing this. It's miraculous. Am I doing irreparable damage to something? I don't know.
Oh also between uses I leave a wet sponge in a plastic tray near the heads. Figure out a way so you don't forget it's there.
Also I always store the printer with the pressure lever engaged, remove any media so you don't get dents. Seems to help, and makes me feel like I'm in control.
You need some kind of substrate stiffener behind the triply folded moist paper towel, I use a 8.5 x 11 piece of paper folded to be 4.25 x 11. The paper towel is folded so it is about the same size and shape. The best way to moisten the towels is to fling some drops of water onto the open towel with your fingers, then scrunch it up real good, then open it again and fold.
Fold about 1" of the towel around the back of the 4.25 inch substrate dimension so you can get the thing through the feed, with the pressure lever released. Take the actual swipes with the pressure lever engaged.
After about 2 swipe rows you will have to be extra attentive not hanging up the carriage on the towels. Just keep pushing the towel away from you so you clear the carriage.
Until you are finesseful at this you will hang up on the towel quite often, learn to deal with it.
Rather that letting the dirty parts of the towel feed down into the lower paper guide, fold them towards you at a right angle, this is also useful for pushing the towel out of the way of the carriage while swiping.
With the carriage pulled away from it's parking position, you can see the cross-hatched, ultra-grimy wiping pad. Once in a while I give this a pat with a very clean, slightly moist towel. I think it's best not to wipe it down too much since this seems to remove the lubrication and you get a squeaky sound until the grime reestablishes itself.
You release the 98xx carriage by pressing down on the blue thingy.
Remember, we're talking about notoriously filthy canvas media here, an RC guy should not have to do this very often at all which is my recollection from my own RC days.
So, good luck. Please use this technique at your own risk, as far as I know it's OK on the long term, then again it might be a formula for disaster. Have a nice day.