|"its been weeks since it happened"|
If you had unplugged the keyboard if possible and cleaned up the peroxide right away, including inside of it, the keyboard might not have been damaged, but it's probably too late now.
Spilling liquid on a keyboard is one of the most common things that damage it.
In this case, you probably MUST replace the keyboard - it was probably damaged by the peroxide.
If you have a desktop computer, regular keyboards are not all that expensive, and there may be local places that have used ones for even less, or someone you know may have a spare keyboard they can give you or sell to you cheap.
If it's a laptop keyboard, they're more expensive but not unreasonably so - there are plenty of them available brand new on the web for a reasonable price - but you need to determine the part number of it by removing the keyboard to make sure you get the right one. Most models have a Maintenance manual that can be downloaded from the system maker's web site that can be examined regarding how to remove the keyboard.
The part number is usually on a label on the bottom of it. If that can be read without removing the ribbon cable for the keyboard, do not remove the ribbon cable - it's often finicky to plug back in.
If you can't use your hands normally, have someone assist you.
In the mean time, for most things the original keyboard was able to do previously, you can
- use a USB keyboard or a PS/2 keyboard. If you have an older laptop that has a PS/2 port, you can use a PS/2 keyboard - if the laptop has a PS/2 port see the Owner's or User's manual - you may need to do something to disable the original keyboard.
- use an onscreen keyboard -
e.g. this one is one that several of my disabled friends use - it's free and very good - if you can move your touchpad cursor or any type kind of mouse's cursor fairly accurately, it's easy to use.
One friend was only able to use two fingers accurately on a corded USB touchpad mouse and could hold up her head but was otherwise a quadriplegic (she couldn't move her hands) and she loved using it.
There's also one built into Windows but it's not as good.
If you can type osk (Enter) in the Start Search box it will pop up on your screen.
Both can be confgured to load whenever Windows loads, or you can make a shortcut on your desktop screen to load them only when you want to.