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Lots of good tips and tricks added so far. Really though. It truly comes down to what your trying to accomplish. Ants, spiders, roaches, etc...
Quick thoughts,
Spiders, being arachnid don’t groom themselves. So, no amount of any spray will help against spiders. Unless, they themselves are directly sprayed. The other issue with them is they are built like 4X4’s so they never bump or scrap their exoskeletons. So borax or dieatomasish earth won’t dry them out.
Ants IMO are best baited so that it can get back to the queen and kill the colony. I make a mix of boric acid, sugar, and water for ants. You can use peanut butter instead of sugar for protein ants if you’ve got those. Swarming ants are a seasonal pest that just happens.
Other options are water activated granules that you can spread in the yard that don’t emit VOCs and can then be activated by a light watering.
Of course baits work well but to my knowledge can’t/shouldn’t get wet.
One last thought, no pest tech should be inside spraying anything. The days of baseboard spraying belongs in the 70’s. There are plenty of options with baits, granules, inside wall treatments, etc.. a bug indoors that has crossed a proper barrier on the exterior will die shortly or already be dieing when you see it indoors. A twitching bug has had a leathal dose. The cholinesterase inhibitors are in effect. Pest control should be applied according to the pest. A good tech will evaluate and treat accordingly.
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