I am only using 2 bug sprays in the house. Safer Insect Soap. Great stuff. I use it often just in case. I did have 2 small outbreaks of spider mites a while ago. And, 90% alcolhol for the mealybugs. Do not have many of those right now, thank goodness. When I mix the bulk Safer into my spray bottle, could I add some alcohol? I have not seen either spray do any damage to my plants, my nose or my fish.
I probably wouldn't mix them because you'll be reducing the concentration of the alcohol a fair amount when you put it in and then dilute it all with water. Alcohol at a much lower concentration won't be nearly as effective against the mealies.