first off get a new lint filter part number WE18X53
and it's around 20 to 30 dollars depending on where you buy it,now when you say you cleaned the dryer do you mean you cleaned just where the clothes go into or did you unplug it and take it apart and clean it out?if you look at the inside back wall you'll see holes,on g.e. dryers lint builds up behind the drum and the heat shield,you can try vacumming the lint out of the holes but the best way is to pull the drum,clean the back of the drum out where i was just telling you about,vacing out the cabinet where the motor is and then blow off the motor and cabinet with the shop vac the other side of it blows air and clean out the duct where the lint filter is and clean out the door,then blow out the vent line,if the line is long you can remove it from the dryer and blow it out with a leaf blower,it sounds like the dryer never has had a clean out,i know you most likely will have to call some one in to do this but for now with a shop vac set it up to blow,remove the lint filter and blow all the lint out of the duct,blow it for a few seconds the vac up the lint and do it again until it's clean,then vac the back of the drum,if you put a light in the drum you can see the lint through the holes,you can try blowing through the holes to lossen the lint and then vac it out and see if that helps but the dryer has to be taken apart and cleaned so you don't have a fire,this should be done at least once a year if it's gas and once every 1 1/2 to 2 years if electric,this way your clothes will dry on time and mostly so you don't have a fire. also when it's pulled apart you can check all the parts to make sure nothing has to be changed out like the rear bearing and rollers and pulley,also check the heater to make sure it's not sagging after a while on electric dryers the heater coils can sag down and short out,when you have it apart you can tighten them up and bend them up into shape again,hope this helps and good luck with your machine.