You can test a little corner to see if they are the ones that get messed up with a liquid. Use a drop of water on a corner of the strip, if it feels "slimy" then you have the strips that fall apart when wet. You cannot clean those with anything. They also tend to fade a lot quicker than the all plastic strips. I have no clue why they ever switched to that printing method, I don't think they use that anymore as all the more modern stepper machines use the all plastic variety. If you post a close up photo of the strips, we might be able to tell what you have.