It will make cleaning it easier.
Clean dryer duct in wall.
The first thing you have to do is locate where the duct begins and ends.
If your dryer used a soft foil style vent to link to the wall duct get rid of it.
In the photo above the back of the dryer is on the right and the wall bent on the left.
Use the hose attachment of a vacuum cleaner or shop vac to clean in and around the hole at the back of the dryer.
These hoses are a known fire risk.
I personally replaced the original semi rigid venting with a pair of 90 degree.
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.
Reattach the hose and clean the exterior vent.
If you can detach the length of duct where it meets the wall do so.
Detach the dryer vent hose from the wall.
Now you are going to pull your dryer away from the wall enough to get in there behind it.
The round brush tip fastens to a flexible fiberglass shaft that can be lengthened in sections.
Remove and vacuum the hose.
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Cleaning lint from a dryer duct requires a vacuum.