Stripping seasoning from cast iron
Do you need to remove a bunch of burnt-on stuff as well as the season? If the pan is clean but not rust-resistant or non-stick like you want, I'd suggest just treating it like you were doing it for the first time and just season over the old. It's not like you care about hurting the old season--you'll just be thickening it and filling in gaps.

If you need to get it back to day zero, there are definitely questions here with good answers about how to do it.

But the first thing I'd try, since the day zero cleaning methods are fairly drastic, is to make sure it's as clean as you can manage, then just go ahead and season. I have had good luck rehabilitating pans that were poorly seasoned but otherwise OK by doing this.

Based on your response in the comments, I would definitely heat up the pan in the oven as high as it will go, and let it go until it stops smoking (put the cold pan in the cold oven to start). That should burn off/dry any excess oil, which it sounds like you have. Then I'd let it cool enough to handle, then season as if it were new. I don't care for the "tacky" seasoning because it's too easy to get a buildup of unseasoned grease. So I'd cook that down/off and start over. And I always rinse with the hottest water my sink makes, to prevent buildup--no soap, though.