Dryer is hot but takes two cycles to dry

My dryer is about 3 years old but has sat in storage for 2 of the 3 years. Now that it's being used it's definitely hot but takes 2 cycles to dry anything. Plus the lint trap never fills up. I get about an inch or two of lent at the very end of the trap. I'm in an apartment so I had them clean out the vent to outside. They said there was some clogging but not much. I cleaned out the tube that attaches to the wall and made sure there weren't any kinks in it. After all that it still takes forever to dry. Plus I found that if I pull the lint trap out about an inch or two while it runs it fills up with lint all the way to the top. I don't know what else to do. Do I need to open up the dryer and clean lint out from the inside? If so, does anyone have any pointers?

 

You have a clogged vent some place, Take off vent tube at back of dryer and dry 1 load of clothes, Bet they dry OK. You than have the information to take to apartment to get them to clean vent right. We run into this all the time.

 

Mice nest inside?..................

Can you tell if the volume of air being discharged to the back is paltry? And what is the temperature being discharged? (Use a meat or ? thermometer that can go up to 160 or so) And also, the seals of the dryer have to be good so that cool room air does not enter the drum without going through the heat element first.