"Salafi" is the name of a new school that claims to follow no school in Islam. We call this "la-madhhabiyya."
Da`wa is da`wa to Islam, and our understanding of Islam is that of the majority of Muslims since the beginning of Islam until now. They are known as Ahl al-Sunna wa al-Jama`a, not "Salafis." Shaykh Hisham Kabbani examined this question comprehensively in his book Islamic Beliefs and Doctrine According to Ahl al-Sunna: A Repudiation of "Salafi" Innovations, in three volumes.
May Allah guide us to the right path, the path shown by the Prophet and followed by the Companions, the Tabi`in, and all those who follow them until Qiyama.