After many years of collecting junk I have sold or binned most of it, mainly because I kept buying stuff because I coundn't find it. Quite often I would find the part only to discover that the diff sitting on it had broken it anyway.
The painful bit was parting with things like spare steering boxes, starters and alternators.
Next up are pieces of timber, paint tins, boxes of wall tiles, countless bicycles, that old stick welder, loads of broken power tools (no, I am never going to fix them), patio heater (why did I but that?) and loads more.