Swore off oscillating multi-tools for years. Thought they were just for demo. Used one to undercut a door jamb for flooring. Felt like a total idiot for waiting so long. It was the perfect tool for that job.

Remember my buddy who tried to make a "pizza" with canned tuna, strawberry jam, and leftover mashed potatoes? Looked like a crime scene, but he swore the sweet and salty thing worked. Sometimes you just gotta block out the haters and take a bite. Your combo sounds way more normal than that.

My buddy built a whole coffee table before letting the wood settle, ended up with a permanent bowl shape in the middle.

Hold on, doesn't your buddy see that calcium chloride tests are a total snapshot? They only measure vapor coming out of that one spot for a day or two. @noahs82, what about the rest of the slab or how conditions change next week? A good meter gives you instant readings all over the place so you can actually map the problem. Sure you need to know how to use it, but that's true for any test. Relying on just the old school method might mean you miss the bigger picture.

Nice! I've done the toothbrush thing too, it's a solid fix. I mean, for really stubborn grime I'll sometimes hit it with a bit of contact cleaner spray after the alcohol dries.