Waswas is from Shaitan and no way to get rid of it but to drive Shaitan away. You need to focus on the fact that it is from your worst enemy (Shaitan) and seek help from Allah, The Most Exalted, to protect you from Shaitan.
Repeating Estighfaar, and Salawaat and LA HAWLA WALA QOWWATA ILLA BILLAH can be very helpful.
'Wassalam.