My filters? need cleaning

\015 My vacuum cleaner (Nilfisk) is stopping as it is overheating, how can i clean the filters? I have tried but it still has the same problem..I have taken out the square felt layers and shaken them and i have taken out the pleated plastic one but it doesn’t seem to have made any difference at all..Rosemary\015 – Nilfisk Family Vac Bagged Canister Vacuum