Mark, I totally agree with Robert, please keep the medals all safe together. If they become separated they end up on Ebay. You need to ensure that there is a safe line in the family, i.e. whoever gets them from you will care for them and pass on the same sentiment to the next recipient. I collect medals and artifacts which belonged to the men from my area but I would much rather they were held by a family member who cared for them (I would give them back to a family who demonstrated they cared).
By the way, all the ribbons and medals shown in the photo are mixed up. The Victory Medal (bronze/brass colourred) should be with the ribbon on the left (rainbow effect), the star should be with blue, white and red ribbon (the ribbon on the right) and the British War Medal (Silver) should be with the ribbon in the middle (the one with the orange band in the middle).
Also, the brass strip in photo no. 3 is a wound stripe. This would have been worn on the left sleeve of a soldier to signify that they had been wounded in action.
With regard to cleaning, although it is down to personal taste, I would suggest leaving them alone. The tarnish shows the age of the medals.
Please look after them
Regards
Pete