1 Sticking drawers. Try using white candle wax or soap to make them slide.
2 Stuck window. Position a splint or wedge of wood at various positions and tap gently with a hammer. Apply white candle wax to maintain.
3 Stiff oven rack. Use petroleum jelly on sides to slide.
4 Stubborn screws. A drop of vinegar, baby oil, WD40,  or peroxide will loosen rusty nuts, bolts and screws.
5 Stiff sliding doors. Try furniture polish. When applied don’t forget to move doors back and forth to distribute the application.