In the summer, at times big insects sometimes invade my house. A lot of times they get behind the oven. The most practical way to kill them is with cleaning spray as I can’t reach them. Even when I can I feel a bit disgusting to step on something that big. Is this permitted?
It is permitted to kill household pests and insects that are annoying and bothersome. If it is possible to kill them in a way that they don’t have pain when getting killed that is preferred, however if you can’t then it is still permitted to kill them with the spray.
Shailas Yaavetz 1-110, Igros Moshe CH:M 2-47(1), Minchas Shlomo 2-60 (28), Nefesh Kol Chai chap. 5-6,7, also see ftnt. 116 in the name of R’ Eliyashiv zt”l.