Here are some Blu Tack alternatives that don't leave marks. Hang things on your walls without worrying about marks with these products.
A cheap, inconspicuous and more elegant alternative than taping your tablet to the desk to prevent slipping : r/osugame
Scotch 2oz Removable Mounting Putty : Target
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This reusable tough tack is made from premium materials, putty-like formulation for easy moulding and quick fastening. A very useful adhesive for many
150g Tough Tack for Walls No Mark | Multipurpose Reusable Adhesive Putty | Clean & Easy to Use, Washproof Invisible, Non-Toxic, No Mark, Handy Size
Bostik Blu-Tack 75g - Stationery
150g Tough Tack for Walls No Mark, Multipurpose Reusable Adhesive Putty
What is a Tack Cloth? (& How to Use It the Right Way)
Does White Tack Leave Marks on Walls?
Is There a Blu Tack Alternative That Doesn't Leave Marks?