The shelf life for Natural Guard Spinosad Soap Concentrate is up to 3 years from the date of purchase if stored at room temperature.
Natural Guard Spinosad Soap Concentrate is applied at the rate of 7 oz. per gallon of water. You can use a hose-end sprayer if it can be calibrated accordingly. Apply when insects are present. Thoroughly spray all plant parts with diluted solution to wetting, including undersides of leaves.
Yes, Natural Guard Spinosad Soap Concentrate can be applied to tomatoes and can be applied the day before harvest.
Natural Guard Spinosad Soap Concentrate is labeled for use on apples
We recommend using a bait for slugs such as Sluggo Plus: https://www.domyown.com/monterey-sluggo-plus-snail-slug-killer-p-1584.html
You will want to use this outside along the foundation near where you are finding them indoors, and you could also use bait indoors, just applied along a wall if it's a bare floor or in bottle caps or bait trays.
You definitely want to check for excess moisture in the area and just outside of it, since that is the condition that favors this pest. I would also check seals on doors and windows and around utilities.