Do you have to say anything while purifying clothes and other things from Najasa? Do you have to send Salawaat to the Prophet (saw) and his immaculate family? Or can you just simply say nothing while doing so?
Bismillah,
Asalamu Alaykom,
No it isn't necessary for you to say any specific words or have a particular intention for purifying something; you may just do the action. Yes other acts such as wudu, ghusl, salah and fasting etc would require an intention.
May Allah grant you success