I used this product for 3 years & was pleased, especially with the abundance of copper it removed, but decided it wasn't up to removing all the carbon in my bore. Consequently I decided to buy some Bore Tech C4 carbon remover. I used both for the next year. The Bore Tech C4 certainly did remove some carbon that Wipe-Out missed, even after a 24 hour soak with Wipe-Out. I then decided to try using the Bore Tech C4 first & Wipe-Out after the Bore Tech. This also got good results. However, in the process, I noticed Bore Tech was also removing copper, which was a surprise to me. I also noticed Wipe-Out was removing significantly less copper than before. Next I tried something a little different. When using Bore Tech C4, I allowed it to sit in the bore for an hour or more before going through the final step of the Bore Tech ritual. When I did this, I discovered Bore Tech C4 seemed to have removed all of the copper, because when I used Wipe-Out after the long soak time with Bore Tech, Wipe-Out never had any blue on the patches (indicating copper removal).
All this made me wonder if Wipe-Out has a shelf life. Before I forget I should mention, I always used the accelerator with Wipe-Out & most of my soak times with Wipe-Out were at least 8-15 hours. I've done this routine at least 10-12 times using Wipe-Out last. I've concluded, either Wipe-Out has a shelf life or Bore Tech C4 does a better job.
Bore Tech has an advantage. In my experience, it does a better job. However, compared to Wipe-Out it is a significantly lengthy ritual, especially when compared to Wipe-Out. I have no idea if the extra copper Bore Tech removes has an influence on accuracy. Perhaps what little copper & carbon that's left by Wipe-Out, has no significant influence on accuracy.
A final note: Last year I retired my Savage barrel for a Shilen precision match w/ratchet rifling in a tight necked .250" neck diameter. The cleaning process seems to go faster now & Wipe Out seems to be almost equal now, but in my old barrel Bore Tech C4 seems to remove more carbon & surprisingly more copper.