Carefully and gently take a used razor along the surface, as if you were shaving your legs, and the bobbles will come away immediately.
Then put some sticky tape over the bits and hey presto a smooth surface again!
Carefully and gently take a used razor along the surface, as if you were shaving your legs, and the bobbles will come away immediately.
Then put some sticky tape over the bits and hey presto a smooth surface again!