Tycellent 0 Light Poster

Is anyone familiar with "removing" an image from screen with SDL? It's just simply a toggle on/off function that i'm looking for. I don't really want to free/release the image, since i intend on using it again throughout the program.

switch (e.key.keysym.sym)
{
    case SDLK_a:
        drawSDL_RenderFillRect(...);
        break;
    case SDLK_b:
        **remove the rect**
        break;
}

Cheers,