Update. Used the enzyme cleaner and all seems good. Had to saturate with solution first. Laid it on plastic sheeting to do this. Had to towel dry. Turned it over once and then after a while lifted onto side and rested against wardrobe to dry thoroughly. Had to repeat with clean water. Dries remarkably quickly because I think the solution just runs through the springs.
Thought I would give update and details in case anyone else in same position in future.
Conflicting high cholesterol and triglycerides advice
Our Welfare State. Is it broken?
NHS U turn on trans terminology