My strategy is, and always has been, if I can look it up, I don't remember it. That being said, there's a lot of things that I write down and store electronically so they don't get lost amid the clutter.
For instance, what size spark plugs does my car need? I have no clue, because it's written down somewhere. However, it's cumbersome to look it up, I don't so the task frequently enough to just ~know~ it, but I have a document on my phone that has all that kinda stuff. What size gasket my espresso machine needs, tire size on the car, partner's ring & clothing sizes, which Starbucks's doubleshot flavor she's into this month...it's almost like a quick index for the most popular searches in my exocortex.
I've found that to be a very effective memory aid...assuming I remember to add the appropriate items to the list. :)
This leaves me with plenty of room to hold useless factoids like the world's longest conga line, and a list of the companies in the world that manufacture periscopes.