The Prophet salla Allahu alaihi wa sallam told us that the Du’ah is blocked until a person offers salutation to the Prophet salla Allahu alaihi wa sallam.

This is in general Du’ah.

Specific Du’ah don’t need this as in the case in prostration.

Is it true that before and after every dua we should say Durood or else our dua wont be answered?