It's not hard if you use the most efficient method and have the right equipment.

Just moved into our new home and discovered glue on hardwood throughout kitchen and tracked/dripped into the great room. Used Mirage Clean to remove it and it worked. First, sprayed the cleaner on an O'Cedar Microfiber Flip-Mop and mopped a small section. Then, got down on hands and knees and did each spot where the glue was. Sprayed some Mirage on a soft cloth (washcloth) and rubbed it on, gently, then scraped the glue off with my fingernail. Too concerned that anything more abrasive than my fingernail would take off the finish. Did the whole kitchen/dining/great room this way. At the end, I mopped the entire area again with Mirage Clean. This product I got from my flooring dealer; I plan to use it regularly for cleaning. No residue build-up. He also said Armstrong products are very good. Took me 12 hours of hard labor, hands and knees, but worth it, as I now have a glue-free hardwood floor and I didn't damage the surface. Twas not a happy camper when I discovered this and I probably could have complained loudly and insisted the builder take care of this. But I wanted careful attention to it, not a quick clean-up. As an award to self, I went out and found three counter stools on sale! Thank you all you Garden Web members. You've helped me tremendously during the building process.

This will happen if you cut onions or garlic on a wooden board. I keep a dishwasher safe plastic board for stinky stuff. You can redeem your board, you may have to try a couple of things before you have success, try them in order: 1)Sprinkle board with kosher salt. Cut a lemon in half, use the cut side of the lemon to scrub the salt into the board. Scrub well, then rinse and towel dry then let air dry thoroughly. Sniff and move on to step two if necessary. 2) Make a thick paste of baking soda and water. Scrub it in with a green scrubby. Same rinse and dry and sniff test. 3) Sand off 1/16". Some people would recommend a bleach solution before resorting to sanding, but I would rather just sand, then have bleach impregnate the pores of the wood that I will then cut on. Whichever one works, once you get rid of the smell, give the board a nice coating of oil to rejuvenate it after the harsh treatment. Good luck.

It might not be all glue, it could be the seams of the paper itself. Most wallpaper is printed on top of a white back and if your seams are not super tight, the white edge of the paper shows. Professional paper hangers often overlap the edges of the paper slightly and do what is called a double cut through both layers of paper so that the seams are really tight. If that is the problem, there are some tricks you could try. One is to get a small amount (a quart is usually the smallest) of acrylic paint matched to the main color of your paper and rub that lightly into the seam to help stain the white edge. I have used eyeliner on black paper, worked well. If it is just glue, you could try a solution of TSP and hot water. As well as DIF there is a product called GooGone that might work for you as well. As javiwa said, test on a scrap of paper first to make sure it does not damage or remove the color in your paper as well, and work gently.