Good luck, there's just about as many ways to get rid of clippings as there are mower brands. Many have been mentioned and are valid methods. But it also depends on the mower and conditions of the turf as well. Some are hard to explain via text based communication. At least for me. You'll get it figured out. The one thing no one mentioned is if these clumps aren't all over, as in a few here and there, is walking it with a backpack blower and blowing them out.