How do you clean and prepare the surfaces to be marked out ensuring where appropriate that grain flow is taken into account?

To clean and prepare surfaces for marking out, first remove any dust, debris, or contaminants using a soft cloth or brush. Ensure the surface is smooth and even, checking for any imperfections that may affect accuracy. When marking, consider the grain flow by aligning your measurements parallel to the grain direction, which will help prevent splitting and ensure a cleaner cut. Finally, use a sharp marking tool to create precise lines that are easy to follow during the cutting process.