Thanks to Steve Tallent for this spider repellent recipe and how-to:
"A mixture of any or all of them should do the trick. I personally take no chances and mix a bit of all of them together in varying ratios until it smells good. Grab a reusable spray bottle and squirt a bit of natural dish soap (just a tiny bit, not much is needed), a small splash of white vinegar, pour in the essential oil mixture and add a couple cups of water. Shake thoroughly and then go to town spraying down any and all surfaces that you want protected. I’ve been known to spray down the floor around our beds as an extra measure of protection. We have diffused eucalyptus essential oil in high concentrations in closed-off rooms for a few hours at a time and come back to find all the spiders in there curled up dead. It’s well worth it to get rid of a known spider issue inside a house!"