/diy/ - Do It Yourself

I feel like I'm missing a step /diy/. I started stripping the paint off of all 4,500ft of moulding in my 1800s house to return it to its natural wood. Thought it would be a nice indoor winter project. There's like 6 layers of paint covering it. Citristrip isn't doing shit after letting it sit covered for 24hrs. I've done furniture before and it was never this big of a headache, I actually found it a nice relaxing project. This doorway for example ive stripped, scraped, sanded 3 times and it's still barely coming up. What am I doing wrong?!