Your goal is to attach one straight side of the tee to the wall or floor vent and one to the dryer outlet.
Clean dryer duct in wall.
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.
Remove and vacuum the hose.
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Rather than hire a professional a diy cleaning job saves money.
Cleaning lint from a dryer duct requires a vacuum.
If your dryer used a soft foil style vent to link to the wall duct get rid of it.
If you can detach the length of duct where it meets the wall do so.
It will make cleaning it easier.
The first thing you have to do is locate where the duct begins and ends.
The round brush tip fastens to a flexible fiberglass shaft that can be lengthened in sections.
In the photo above the back of the dryer is on the right and the wall bent on the left.
Now you are going to pull your dryer away from the wall enough to get in there behind it.
Use the hose attachment of a vacuum cleaner or shop vac to clean in and around the hole at the back of the dryer.