Evidence of years of dust

Decided to clear out the conservatory and found a vase full of these creatures in the bottom. I haven't seen this vase for years amazingly the big spider started to run when I put water in it.
Had a lovely day spent the morning with a family I met whilst at work. Shopped at Aldi then came home and I have cleared out 3 large boxes of books!!!! The bookcases are getting bare! Might even be able to get rid of one.