These hoses are a known fire risk.
Clean dryer duct in wall.
Remove and vacuum the hose.
Use the hose attachment of a vacuum cleaner or shop vac to clean in and around the hole at the back of the dryer.
The tools and supplies you need to clean a dryer vent duct include a vacuum with a long hose attachment dryer vent brush kit screwdrivers and ul listed metal foil duct tape.
The round brush tip fastens to a flexible fiberglass shaft that can be lengthened in sections.
Brush kits come with a long bristle brush to clean the lint filter area as well as a round bristled brush that can clean out a 4 inch round rigid dryer duct the kind you should have for all concealed portions of your duct run.
If you can detach the length of duct where it meets the wall do so.
Cleaning lint from a dryer duct requires a vacuum.
The first thing you have to do is locate where the duct begins and ends.
In the photo above the back of the dryer is on the right and the wall bent on the left.
It will make cleaning it easier.
Now you are going to pull your dryer away from the wall enough to get in there behind it.
Reattach the hose and clean the exterior vent.
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I personally replaced the original semi rigid venting with a pair of 90 degree.
If your dryer used a soft foil style vent to link to the wall duct get rid of it.