Yesterday we cleaned half the garage, something we try to do annually. It's amazing how clutter builds up -- things no longer used, broken things to fix that are unfixable, and general junk. We tossed out 3 bags of junk, have a box of metal recycling, and a few items we'll try to sell. I had several pairs of yard sneakers that were literally falling apart but I just hadn't got around to throwing out. [I tend to use things past the time when they are not usable.]
We swore to be honest with each other when answering the question: "Is that actually going to be used and is it worth keeping?"
We both have a bit of a packrat mentality (I'm worse), so we kept each other honest and eliminated clutter that needed eliminating.
The other half of the garage will take 2 sessions, as I built shelving units many moons ago, and we'll pull everything out for sorting. When we're done we'll feel good about the effort ... until next year when we do it again!
One of my relatives has moved, on average, every 4 years. They have no clutter as they are constantly de-cluttering for the next move ...
Side note -- our garage faces into the wind, so a lot of our cleaning is actually that. We sweep or blow the garage out regularly and keep the door shut most of the time, but we get a constant influx of dirt, grass, and leaves. Note to self -- build the next garage so it faces north!