Fuel tank

[Sarkhan]

Hi all.
My car is Mercedes Benz E 240 1998 (Benzin). Recently, I replaced the fuel filter on my car and after two month passed, the filter was blocked and it was replaced again.
Now, I suspect the inside of the fuel tank is dirty and hence, I want the fuel tank to be cleaned/washed or its strainer to be replaced . Which one would you recommend to do in order to prevent the fuel pump and fuel filter from damaging/blocking.

It is so urgent. If someone answered for my question as much as possible, I would appreciate him.