Your local pet store should have some pet stain removal products. Nature's Miracle works really well.
White vinegar will help to neutralise the smell, loosen some of the sticky residue, and lighten the colour, but you may not find it effective to fully remove the stain.
Be sure to clean up urine messes as soon as possible because if left alone rabbit urine can damage the surface its on (upholstery, carpet, wood flooring, tiles, anything).
See the related link below, "Rabbit Butt Bath" (Krempels).
If the urine is still wet, give the rabbit a "dry bath":
If the stain is dry, you can try a "spot bath." If the stain is small, fill a bowl with lukewarm water, and use a cloth.
If the stains are all over the hind legs, use a baby bath or some other small tub that you can hold the rabbit steady in. Be very careful, because a strange experience like this can make a rabbit panic, and when rabbits panic they can easily injure themselves. Do not use a regular bathtub: you won't be able to control the rabbit enough, and serious injury is much more likely. Keep the water level low, never higher than the belly. Use lukewarm water.
If water isn't enough to clean the stains, you can use a rabbit-safe shampoo. You can't use just any kind of shampoo: most shampoos (even baby shampoos, pet shampoos, and natural shampoos) contain harsh ingredients that are not good for a rabbit's delicate skin. Do not use leave-in shampoos or conditioners, because rabbits lick themselves and they will ingest it. To find a safe shampoo, ask your vet for a recommendation of a local brand, or ask if your vet can sell you a clinical shampoo. Look at health food stores: look for a hypoallergenic, non-medicated shampoo, with as few additives as possible. Oatmeal is a good ingredient, because it soothes the skin.
If your rabbit is stained with urine, something is wrong! Don't just treat the symptoms: treat the cause, too. A bit of yellow staining on the feet of white rabbits is pretty common, but otherwise your rabbit shouldn't be stained. Rabbits are naturally clean animals, and if they're dirty that is a bad sign: maybe they are sick, or maybe their habitat isn't big or clean enough.
Bring your rabbit to the vet and figure out together what is wrong, so you can do something about it. See the related questions below for more information, and links.
soak it bleach and soap and hot water
Wine Stain Removal Cheap Carpet Cleaning Remove Urine Stains
Dog urine can be removed from curtains by soaking them in vinegar and baking soda. It absorbs the odor and removes the stain.
To remove rabbit poo stain from a carpet, start by picking up any solid waste. Then, mix a solution of warm water and mild dish soap and blot the stain, taking care not to spread it further. Finally, rinse the area with clean water and blot until the stain is removed.
Nothing will happen if you touch your rabbit's urine, unless you have a skin reaction to rabbit urine, which is highly unlikely.
Urine be gone products are designed to eliminate odors and stains from urine. They contain enzymes and other ingredients that break down the urine molecules, making them easier to remove. It is effective in many cases but results may vary depending on the specific product and type of urine stain or odor. It's best to follow the instructions on the product and test it in a small inconspicuous area first.
No, rabbit urine is not a carcinogen (cancer causing agent).
To remove urine stains from travertine, mix baking soda and water to create a paste. Apply the paste to the stain and let it sit for a few hours. Scrub the area with a soft brush and rinse with water to remove the stain. Repeat the process if necessary.
To remove a urine stain from a cloth couch, first blot up as much of the urine as possible with paper towels. Mix a solution of white vinegar and water (1:1 ratio) and apply it to the stain, then blot with a clean cloth. Sprinkle baking soda over the area, let it sit for a few hours, then vacuum it up. Repeat if necessary.
To remove urine stains from a wood toilet seat, mix equal parts white vinegar and water in a spray bottle. Spray the solution onto the stain, let it sit for a few minutes, then wipe it off with a clean cloth. Repeat as needed until the stain is gone.
To clean a rabbit urine stain off hardwood floors, start by blotting up as much liquid as possible with paper towels. Then, mix equal parts water and white vinegar and use a clean cloth to gently scrub the stained area. Finally, rinse with water and dry the area thoroughly.
Mix a solution of equal parts water and white vinegar, then dab the stain with a cloth soaked in the solution. Avoid rubbing the fabric to prevent spreading the stain. Rinse thoroughly with cold water and let the curtains air dry.