I say the same about the stuff I drag home. Always true too.
One of the best things I got for basic reno, besides the penetrating oil, lithium grease, and fish oil rust guard, was a set of mini bottle brushes from Bunnings. Came in a case, all graduated by size, nylon, brass, and steel, put 'em into the drill and spin (usually with gasoline as a solvent). I've gotten into more holes/bores than I can count with that little $5 set. A true hoarder's must have.