First, use large grit sandpaper for the start, once some wood is exposed, switch to a finer grit sandpaper
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It depends on what you have available, and what you want to do afterwards - paint stripping chemicals make more mess, but are gentler on the wood beneath. Heatgun + scraper is quicker, but requires care to avoid scorching the wood. An orbital sander will cut through large areas of paint, but is not good on textured or carved details.
paint thinner + scraper?