Here's What To Do If You've Tried Everything, But Your Bundt Cake Won't Release From The Pan - Tasting Table
Briefly

Bundt cakes often stick to their intricate pans due to inadequate greasing. Unlike smooth tube pans, Bundt pans have many decorative grooves that require thorough greasing with butter or cooking spray. If you've already baked a cake that is stubbornly stuck, placing it back in a warm oven or creating steam with boiling water may help release it. Comprehensive greasing techniques are highlighted for future baking successes, ensuring cakes can be easily removed from the pan without damage.
An effective way to prevent a Bundt cake from sticking is to ensure comprehensive greasing of the pan's unique grooves and ridges.
If your Bundt cake is stuck, return it to a warm oven to soften it, or create steam with a bowl of boiling water.
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