Window washing: a small spray bottle, squeegee and cloth can be used on a window, glass door or any outdoor surface.
Window Washing Kit (other option here).
Hand Washing: Your child can also practice hand washing in the bathroom sink, or with a large mixing bowl at a lot table. Using bar soap, and a fingernail scrubber, they can explore lathering and making bubbles.
Table Washing or Surface Washing: With a bucket, sponge and towel, allow your child some freedom in scrubbing, creating bubbles and drying. They can hang wet cloths on a drying rack when completed.
Can also use a scrub brush. Demonstrate for your child how to wash in circular motions, so they can use their full body for large movements.