Question

Why is it necessary to keep the silencer of your vehicles clean

Answer 1

because they should not be dust on silencer

Answer 2

Muffler - The function of a Muffler or aSilencer in Vehicle is to cool theexhaust gases by expansion through it and to reduce the noise of outgoing gases. The exhaust gases must be discharged into the atmosphere with minimum restriction. The restriction in flow of exhaust gases causes back .

And for environment it's strictly necessary