AMPure XP beads are used to quickly clean PCR reactions and are also used in WGS library prep. You can also use them to do DNA size selections! They work well, but are very expensive. I found step-by-step instructions on how to make a home-made version online, purchased the reagents and tried the protocol. I tested the beads by attempting to clean up DNA ladder and I found that the home-made beads work identically to the AMPure XP beads.
Attached is the protocol for making the beads. I followed the protocol exactly. One note, I weighed the PEG-8000 in the fume hood because the fine powder is an irritant if inhaled. I also have attached a picture of my gel comparing clean-up of 100 bp DNA ladder with commercial AMPure XP beads and the home-made substitute.