If you don't have your new Mac yet, you probably shouldn't be selling your old one yet. If you already have your new Mac on hand, you can transfer all of your data from your old Mac or use an older Time Machine backup. A completely fresh-from-scratch Mac is the best way to do this. If you leave behind anything that needs to be logged into with a password, that buyer will have to track you down and get your password to change ownership. It's a security and privacy thing for you, but it's also essential for the buyer. If you're about to sell your Mac, the one thing you don't want to do is give away the data you've been storing on it all these years. Clean the Mac of your personal data before erasing it These directions are based on macOS 13 Ventura operating system. Do not use aerosol sprays, solvents, or abrasives that might damage the finish.Here's how to reset your Mac before selling it or giving it away. Do not spray liquid directly on the computer. Then use a damp, soft, lint-free cloth to clean the computer’s exterior. When cleaning the outside of your MacBook, MacBook Pro, or MacBook Air, first shut down your computer and unplug the power adapter. Do not spray cleaners directly onto the item.Don’t get moisture into any openings, and don't use aerosol sprays, solvents, or abrasives.Disconnect any external devices and other cabling from the product.

Disconnect your Apple product from any external power sources.Abrasive cloths, towels, paper towels, and similar items may cause damage to the item. Here are some tips that apply to all products Product may have specific cleaning requirements, which may vary by the The materials used to make Apple products vary in some cases each I think I would follow this advice from Apple: How to clean Apple products

Clean out macbook pro