If the previous owner used flat white paint on the kitchen cabinets and they are now extremely hard to clean, sanding the cabinets can be a potential solution, but it's not the only option. Here are a few steps you can consider:
Cleaning: Before jumping into sanding, make sure you've thoroughly cleaned the cabinets. Use a gentle cleaner that won't damage the paint or wood. Avoid harsh abrasives or chemicals that could strip the paint further.
Degreasing: Grease and grime build-up can contribute to the difficulty of cleaning. Use a degreasing agent to remove any oily residue from the cabinets.
Spot Testing: Before sanding the entire cabinet surface, perform a spot test in an inconspicuous area. This will help you see how the paint reacts to sanding and whether it will yield the desired results.
Light Sanding: If the spot test goes well, you can lightly sand the cabinet surfaces with fine-grit sandpaper (e.g., 220 grit). Sanding will help smooth the surface and create a better bonding surface for the new paint or finish.
Repainting or Refinishing: After sanding, you have the option to repaint the cabinets using a more durable paint designed for kitchen cabinets. Consider using semi-gloss or satin finish paints as they are easier to clean than flat paint. Alternatively, you can refinish the cabinets using a clear sealant or varnish to protect the existing paint and make it easier to clean.
Hardware and Accessories: While you're at it, consider replacing any hardware or accessories that are difficult to clean or show signs of wear. New knobs, handles, and hinges can freshen up the appearance of the cabinets.
Remember that sanding can be a time-consuming and messy process, so consider your options carefully. If you're unsure about the best course of action, consulting a professional or a local hardware store expert can provide you with personalized advice for your specific situation.