Ok, basically this is what you have to do and memorize in order to clear the screen every frame. After typing it a million times, I decided to store it here for reference. This is from the OpenGL ES From The Ground Up tutorial after typing it a million times.
Standard OpenGl ES, screen clear and initialization:
// Clear screen in OpenGL-ES
glLoadIdentity();
glClearColor(0.7, 0.7, 0.7, 1.0);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glEnableClientState(GL_VERTEX_ARRAY);
glColor4f(1.0, 0.0, 0.0, 1.0);
glVertexPointer(3, GL_FLOAT, 0, &triangle);
glDrawArrays(GL_TRIANGLES, 0, 9);
glDisableClientState(GL_VERTEX_ARRAY);