I have a wood stove with a liner . I decided to save money and clean the liner myself . So I bought the brush and rods to clean the liner and was surprised that it was not very dirty from last year . . Had my first fire last night and noticed there was a lot of smoke .This morning I went to clean out the firebox and the walls are totally black . I do know that the gasket is coming off on the top grid . Could that be my problem ? And if so where can I buy the gaskets .If its not the gasket any help would be deeply appreciated . Thank You .