There are a few ways to get urine out of a mattress. You could buy a special spray on chemical.
Febreze.
White vinagar
You could bleach it.
U cant. Throw it away
this is very hard to remove, you can try a solution of vinegar and water, but in the long run, throw the mattress out.
A urine soaked mattress is bad. You should probably wash the mattress.
Febreze.
White vinagar
You could bleach it.
baking soda
Diluted peroxide does an awesome job cleaning urine stains.
To clean urine from an inflatable mattress blot up as much as possible. You can then clean the area with soapy water. If the mattress has an odor you can use a product such as Urine Gone to clean it again.
U cant. Throw it away
this is very hard to remove, you can try a solution of vinegar and water, but in the long run, throw the mattress out.
You will need to get a professional cleaner to remove the urine. Hopefully, you can also get an enzyme spray that will help neutralize the smell. Invest in a non permeable cover for your mattress, since your pet may repeat the action.
25 % white vinegar 75% water.
To get urine stains out of a mattress, put some hot water into a bowl with a bit of dishwashing liquid. Spray the stained area on the mattress with Vanish stain remover. Leave for a few minutes and then scrub the stain using the soap and water solution and a soft sponge.