Use a soft-bristle brush or cloth to gently scrub the interior of the base. Sprinkle the cloth with more baking soda if there are stuck-on particles. Pour out the water, add some cool water to rinse, ...
Game engines generally want their data in a different format than the one used by authoring tools (eg. .dds rather than .psd for textures) but while there are some tools and libraries to do that ...
If there is heavy buildup of grease, soak the basket and tray in a mixture of equal parts of white vinegar and warm water for up to an hour, then scrub the pieces with dish soap and rinse with water ...