WE have two damp patches on an inside wall. We have used stain block and a drop of bleach. None of these have worked. What can you suggest? YES you can. I use an adhesive called CT1 which is waterproof. Just clean the tiles well with a washing-up liquid beforehand. MY garage doubles as a workshop, but I’m constantly clearing cobwebs from my tools, worktops and windows. What do you suggest is the best way to combat this?