I haven't used any chemical products in/around my garden for 20+ years, though there are external pressures from the neighbors that I can't avoid. So most of my garden beds are located somewhat inside of the property line, and I try to maintain at least a small amount of buffer zones although they might be only for my peace of mind.
I encourage and rely on beneficial insects (Garden Patrols) and try my best to identify them as they are observed in my garden. For necessary fungal disease control and pest control, I only use minimum and mild household mixtures as necessary and ONLY after identifying the problem.
I avoid using even soapy water sprays because typically pest infestations are already being worked on by my Garden Patrol, and prefer to catch and drop into a container of soapy water for most larger bugs. I even let the pest population build up and sacrifice some of the crop in hopes of attracting the appropriate Garden Patrol members.
So far, I've avoided Neem oil though I hear a lot of praise for the product. I also don't use other oil sprays because they are also indiscriminating against insects as well as microbes and fungi. I avoid also general spectrum peroxide and baking soda sprays.
I strive to create bio-diversity in my garden down to the microbial level to try to establish natural balance and equilibrium. For fungal disease, I use milk sprays alternating with AACT (actively aerated compost tea) as preventative and early remedy.
I worry about using single organism biological control even though they are "organic" because I worry about upsetting the bacterial and fungal diversity and balance.... And so far have avoided them. My AACT should contain the beneficial organism. In case my own garden and household ingredients are insufficient or lacking, I try to add small amounts of commercial compost and organic potting mixes and as well as other biologically active supplements like bokashi compost and outsourced live earthworms and nightcrawlers (DH's leftover fish bait) to my compost piles.
I prefer not to general spray Bt because I maintain my entire garden as butterfly garden and grow as many larval host plants as I can. I have had to resort to Bt injection against SVB (squash vine borers) however.
I buy organic or at least untreated seeds when they are available, and don't get any that are specifically treated or if only treated seeds are available. I have been enticed into trading for tomato variety seeds which have evolved into tomato and pepper and, and.... But I like the idea of self-sustaining so I mostly only grow heirloom and OP (open pollinated) varieties and save my own seeds, including biennials that require a second year to mature and produce seeds.
Heh -- ask a simple question or two.... I think that about covers it all.