No hope is there?

[lovelilies]

DD wet the bed last night. Top bunk. Went through mattress onto bottom bunk!
It's a cheap mattress. Is there any point trying to clean it?

I'd get a new one + waterproof mattress cover (cheap in argos).

Get waterproof over from Dunelm, no rustle & doesn't make you hot.

Replace the mattress that's too much urine X

Replace the mattress, it's no point trying to clean it. When you get the new mattress get a protector for it to stop this sort of thing happening again.