To fully remove an object, delete it from the Project Bar. Note this will delete any events using it, so first you'll probably want to add the Local Storage plugin (which was introduced to replace Web Storage), move all your events to using that instead, then delete the Web Storage plugin.
FYI Web Storage was replaced with Local Storage back in 2015, so it must be a pretty old project!
It is pretty old. I put probably 2000 hours into it.
Near "the end" of making it, I cast it away, thinking there might be an "easier" way to make games...Well, there are easier ways, though they are incredibly limiting. I took a peek at C3, and realized I had been using the best all along.
So I am back to making this happen! (Just needs some cleanup, and a little more love.)
Thanks for Construct 3, C3 team! Oh! And thanks for the reply.
One quick tag on question: Is there a search function to help find what might be using the Webstorage? I assumed it was my game score, but at least last night I couldn't find it. I was probably too tired...