Please choose the correct solution to the question: How to rough up the rubber on a inner tube to get a patch to stick.

Solution1: Use the very fine end of a sharpie to roughen up the rubber on the tube to give the patch a good hold.

Solution2: Use the very fine part of a cheese grater to roughen up the rubber on the tube to give the patch a good hold.

Answer format: solution1/solution2
Answer: solution2