I have promised myself that I will not leave that kind of accumulated junk for my kids to sort through some day, but I honestly wonder if I will get around to doing my own purge. It hasn't happened yet.
I took the same lesson from clearing out my parents things. What I'm trying to do now is to clear out incrementally. Doing a full sweep is way too easy to defer to future me and therefore never happens, so I try to do a small amount regularly. My big box of cables (another recent thread here) is a rich source of material that will keep me busy for a while. Pretty sure nobody will appreciate going through that.
Also just trying to notice things around the place that I really don't need, books I'll never read again, boxes that have not been opened for years. A little bit at a time. Removing each one gives a small sense of achievement.
My great aunt died years and years ago (RIP) but as recently as a few weeks ago my brother and I cleaned/emptied a garage where she had hidden some stuff.
More soap bars.
I don't need the physics/chemistry: I know that soap is a stable molecule. I suspect some of the soap bars were dating back to WWII.
My great aunt was also in the "waste not / want not" camp. But as she lived through WWII as a teenager, she was in fear of ever missing things again. Hence the soap bars.
Not to the extreme of the story about the soap, above, but: Something in my mind was changed a little bit more every time I'd go to the store and there were empty shelves. So now I do things like always have a few weeks of TP, and I freeze things like bread and bologna.
I never did that at any point in my adult life leading up to COVID: If I ran out of something, I just picked up more later at the store the next time I was nearby (or any other time; lots of things were 24/7 back then).