Regular cleaning of the lint filter is a must. Make it a habit every time you take out a load. Then it becomes routine and the screen always stays clean for the next use.
First, pull out the strainer and remove any fluff that is stuck to it. Rub a dryer sheet over it to pick up leftover lint (via Better Homes & Gardens). Next, clean the screen lint filter. Use a vacuum if you have a small attachment or a dryer lint brush. Use a circular motion to cling leftover lint particles to the brush. When you’re done with a load and open the dryer’s door, only to find crayons, gum or fur stuck to the sides of the drum, remove the clothes and set the dryer on a warm setting. Try scrubbing it off with an old cloth or rag. If that doesn’t work, try another tactic.
“Remove the excess by scraping it off with a hard rubber spatula,” Merry Maids cleaning expert Debra Johnson tells Today.
https://www.thelist.com/959858/how-often-should-you-be-cleaning-your-dryer/ How often should you clean your dryer?