This is the one which i have drafted for my office. See if this helps.
Hello Friends,
Off-Late, we have all been experiencing lot of pest problems at our work stations. Despite numerous rounds of pest control activity, we have not been able to completely control the problem. We looked into the matter further after which it was observed that, few steps from us, as the owners of the work station, need to be followed too. Here are the guidelines:
• Let us not bring the Evening Snacks from the Cafeteria to the work-stations
• Even if you would like to have some refreshments/snacks, please ensure that you clear and clean the desk, do not leave any crumbs even in the dustbin. Please dispose the same.
• Take care to not leave any snack that you bring personally, out in the open on the desk, which would easily attract cockroaches/rodents and other insects.
• Once you had tea/coffee/refreshments, either dispose the containers or leave the cups/glasses at the pantry for washing.
I am sure this small gesture by each one of us collectively would surely help us contain this into becoming a menace in the future.