We've cleaned hundreds of walls covered in nicotine and this is what we've found 
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You can remove the nicotine that's easy SHYN degreaser breaks down the grime fast, making it super easy to remove
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On very very old walls you can remove the nicotine but you can't remove the yellow stain on the walls
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3% of the time the walls will be stained
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It's a very easy job if you follow my method
THE METHOD
Apply SHYN degreaser onto the wall using your agitator pad on your wall tool
Attach your WET double strength magic eraser wall pad onto your rail base
Agitate the nicotine using your WET magic eraser wall eraser pad (1 stroke system)
Attach your your WET (but wrung out) fluffy absorbent microfibre pad and remove the product and nicotine residue using the one stroke system
Allow the wall to dry
Rinse the fluffy pad out after each wall with water (it needs to be clean to pick up)
Products found under WALL PRODUCTS.