Instead of disinfectants, prefer safe repellants to drive away presence cockroach big and small. Make a dough-mix 1:1 of bleaching powder and āātä and then make marble size balls. Leave this balls to dry in places like cabinets windows and store rooms. These balls easy to handle less clumsy. It cal last a fortnight.
To avoid rice getting clumped add few drops of lemon juice into .....but when? Is it while cooking rice in pressure or rice cooker? Or after rice is cooked?