... but others have used a vinigar & water mix. If you search the WEB, you can find out what the 'home-made' solution is. If you want to use DIF, go to any Home Center or Wallpapering Retailer and they'll have it. I used a big sponge that one would use when they wash a car. It's easier to handle. Mix the DIF as it says using boiling hot water. As you wash and rinse the wall, use a 2nd bucket of warm water to rinse out the glue. This way, you won't be contaminating the water bucket with the DIF solution in it with the glue from the wall. When you finish, let in as much sunlight as you can and see how you did.
My best to ya and hope this helps. By the way, your question should be posted as an original post because at this point, you post got pushed down to the bottom of the Forum. It's a week old already and it exists under an already-existing-post.