Hi there. So, I think you are being given wrong information. Brown recluse spider venom only stays in the body for 3 to 5 days max. Then it is gone. Not sure why your exterminator is giving you such wrong info. And also, he's not doing a great job making your home spider free which absolutely can be done. Even if you had an infestation, a professional can clear it out. There are very effective pesticides as well as methods to use them, especially in entrances to the home like gaps, etc. Also, obviously, wood piles or yard debris. The article I'm going to link talks about how to get rid of brown recluse. https://www.thisoldhouse.com/pest-control/reviews/how-to-get-rid-of-brown-recluse-spiders#:~:text=Fortunately%2C%20many%20broad%2Dspectrum%20pesticides,%2C%20liquid%2C%20and%20dust%20forms. It can be done! Annoying this keeps happening. It shouldn't.