How to Remove and clean crank bearings?

To remove and clean crank bearings, first, ensure you have the right tools, such as a crank puller and a bearing puller. Carefully remove the crank arms using the crank puller, then extract the bearings from the bottom bracket or crank casing. Clean the bearings with a degreaser or solvent to remove dirt and old grease, and inspect them for wear or damage. Once clean, re-grease the bearings before reassembling the crank to ensure smooth operation.