Spray Glue for Black Widow Spiders

I live in Southern California and get many black widow spiders around my home. Spray insecticide just doesn't work on these spiders, as they clean the spray off of them and are right back within the hour.

When I see a black widow, I use spray glue. Once sprayed with the spray glue, they are not going anywhere and I know for sure they are dead. Next day, I brush any glue residue away with a broom. My sister almost died from being bitten by a black widow and I do not want them around.