How does one completely remove all the lint in a dryer, not just in the"lint trap"

A vacuum cleaner with the brush attachment.

I have seen long handled lint brushes in hardware stores.

Advertisements on TV selling a flexible lint remover.

Lowering the front access panel will get you some cleanable area(where the flame is produced)

Otherwise it might be removal of the housing to get at the rest of the base.

Hope this helps,

KBC

I find almost no lint in the base. It's in the piping. I usually have to remove the vent and pull lint out with my fingers.
I also check the flapper outside and remove lint there.

In the pipe I find little. It's the end points.