Are they worth it? Do they hurt accuracy after repeated use?
"Liberalism", Ideas so good they have to be mandatory.
I have used about every bore cleaner out there. The WipeOut works great, I first scrub the bore with Butches then run a dry patch. After that I fill the bore with WipeOut and let it sit over night. Most of the the time I do this twice before the bore is clean. The only draw back is the time it takes to work. As a side note, DO NOT get WipeOut in your eyes!!! I did a while back, OUCH the burning is unreal, the eye was sore for 3 days!!!
Nothing beats a little elbow grease!!!
I've been using Wipe Out foaming bore cleaner along with Wipe Out Accelerator for several years now. In order to not make a mess get some 1/2" OD X 3/8" ID & 3/8" OD X 1/4" ID tygon tubing at your local hardware store. Cut about a 6" piece of each size and super glue the smaller into the larger to make a leak proof connection. Pull your bore guide out of your chamber, assuming you use one, and insert the 1/2" OD tubing into your chamber. You'll have to radius the lip a bit with a Dremel and heat to form to your chamber but this will allow you to apply the foam without getting all over the place. Stick the 1/4" ID end of your rig over the nozzle of the Wipe Out and angle your muzzle down into a catch container. The foam will push neatly through the bore.
I've always been a clean barrel freek. When I started PD shooting, I would clean my barrels to a copper free state every night in the motel room, stink up the place with amonia and lose a lot of sleep to get my barrels ready for the next shooting day. I was shooting bare bullets at that time.
I started using foam cleaners to keep the cleaning process working while I was sleeping and, in the morning, I'd push a few patches and take off for the fields. I think I spent way too much time cleaning and bore foams really helped as they linger in the barrel and keep working where other de coppering solvents lose most of their chemical activity after an hour or so.
Then I started using moly coated bullets. I found I could shoot 200 rounds thru each gun a day and still maintain reasonable accuracy to the end. But I also found that there were some serious drawbacks to using it. I saw that the barrels took 10 to 15 rounds every morning to start shooting accurately again and again. Worse, I discovered rust pits under the moly coating in the barrel when I got back home and cleaned down to base metal. Being an accuracy gunsmith, my business owned a Hawkeye borescope. I would take it with me on PD trips just to monitor my cleaning regimine in each barrel and learn what I could from this. The problem with the guns not shooting on the sweet spots for 15 rounds was less serious as we were usually starting out on a new town and those first shots were usually at the dumb ones that were pretty close.
The pitting problem was serious and a couple of chrome moly barrrels were seriously hurt before I figgered out what was causing it. One of my long time customers always shot moly and never cleaned. He did reasonably well on long range varmint matches. He never had pitting because he always treated this barrels with several patches of 3 IN One oil immediately after shooting. I once looked in one of his barrels and the moly had accumulated to the point that it laid in furrows like wind driven snow! Moly attracts moisture and as your barrel cools, it draws cooler air into the bore and it condenses water. The water migrates under the moly and lays there forming some kind of acid. Sulfuric comes to mind as moly is molybdenum disulfide. But, I'm not a chemist and could be way wrong. I do know what rust is and have found it many times under the moly.
Using moly didn't stop the coppering of the barrels. It was still there and needed to be cleaned out periodically. I still think moly is worth using on PD guns if you don't mind missing a few on the first 10 shots. I never use it on my match rifles any longer as I can't rely on the gun shooting to it's normal P.O.A. until the match is half over.
This is getting pretty long but I will say that I've been using Hex. Boron for a couple of years now and have worked out procedures that make it quite useable. If anyone is interested, I can expound on that later. It's not perfect but it's the best thing out there right now for coating bullets in my humble opinion.
I can only echo your statements, foam cleaners are really good. Following the instructions to the letter was great imput. Thanks JHORNE