Rinpoche teaches that applying the Three Supreme Methods helps enhance the merit of such good deeds:

“If one approaches an offering of service with basic good intention, then one accumulates merit. But when three wholesome attitudes known as the Three Supreme Methods are genuinely applied, an outwardly mundane task can even become a paramita. To apply the Supreme Methods begin by refining your intention, thinking you will perform the work for the sake of all sentient beings. Remember you are not making an offering of service to bolster your self-gratification, recognition, or mileage points. As Shantideva said, look upon yourself as a utensil and think,

Today I vow to work for the benefit of all beings.
May I be a guard for those who are protectorless,
 A guide for those who journey on the road.
 For those who wish to go across the water
May I be a boat, a raft, a bridge”