I use a fine, sharp potatoe knife to scrape off paint. It takes about two days to strip a frame. It can reach any spot or corner. It's a slow process, but it's cheap: no hazardous products, no noice, no fumes, no masks, no protective clothes, just an ordinary potatoe knife. Sanding with waterproof paper, grain 600, makes the job complete. The result is imaculate.