Don't give your rabbit a bath!!!! It will get all wet and heavy and might hurt itself! Mine did and it took to days to recover:(! It could also get pneumonia and die:( mine died from it but the doctor said it was because she swallowed something and couldn't breath right. Still I wouldnt give it a bath, rabbits clean themselves. If you must, use a damp cloth it's much better trust me!
You can give your floppy ear rabbit a bath but it would be best to put him in the shower instead of sitting him in the water. You can purchase shampoo for your rabbit from the pet store. You can also use baby soap if you choose because it is gentle.
Don't run it over water, it will freak out & you will be left with several scratches on your hands. The rabbit usually cleans itself, but if it is bad like it gets mud all over itself, then you need to get a wet rag or sponge & rub it on him lightly. Be sure to keep him calm by scratching him or taking breaks between rubs to make him/her feel less pressure.