In Australia I use a product called "Out of Bounds"
20ml in 2 litres did around windows, doors and corners where spiders seem to thrive. Fine spray from a pressurized sprayer.
Think twice a year will keep them at bay.
No info on active chemical on the 2 ltr container I bought. [Thought that was a legal requirement!] Aha! Sticky on the back of the container - I've removed the multi pages instruction label!
But www.barmac.com.au gives info on Pest Management , and a label there tells me the active ingredient is 100g/lt. Bifenthrin
The 2 ltr container I got will do for years!