If your dryer used a soft foil style vent to link to the wall duct get rid of it.
Clean dryer duct in wall.
Reattach the hose and clean the exterior vent.
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 first thing you have to do is locate where the duct begins and ends.
It will make cleaning it easier.
If you can detach the length of duct where it meets the wall do so.
Cleaning lint from a dryer duct requires a vacuum.
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.
Remove and vacuum the hose.
These hoses are a known fire risk.
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Rather than hire a professional a diy cleaning job saves money.
The round brush tip fastens to a flexible fiberglass shaft that can be lengthened in sections.
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.
Detach the dryer vent hose from the wall.
I personally replaced the original semi rigid venting with a pair of 90 degree.