How to clean your oven

Was baking some Sculpey pieces the kids had made .275 degrees...not so hot.  Kaboom.  I guess that wasn't Pyrex.  The thing was so shattered...I could read only part...Anchor Hocking..ok for microwave, no open flame...something about oven, but too busted at that point to read it. Had to take apart several "layers" of oven (with tools, not just sliding off)  to get all the bits of glass out of the nooks and crannies. ..and while there, used sponge on all the parts rather than just self-clean function.  So...to answer the label of the post: busting a glass dish in your oven is one way to force a "clean your oven" (more than surface, without the self clean function).  Luckily ...very luckily...it burst with oven door closed, not as opening.